An unanswered email can wreck my whole day.
For thirty years I thought it was a character flaw.

Concretely, that means a thing that would make a neurotypical brain frown for three seconds can floor me for three days. An ambiguous remark from my manager. A friend who cancels a dinner. A partner who says "meh" to one of my ideas. A negative comment on something I published. A silence that stretches a beat too long in a conversation. The trigger can be tiny. The reaction is not.

The word "dysphoria" comes from Greek and roughly means "hard to bear." That is what it feels like in those moments. Not regular sadness. Not normal anger. Something closer to a physical pain in the sternum, a collapse, an urgent need to flee or hide. Dodson notes that his patients often use the word "unbearable." I think that is the right word.

Rumination. After a conversation, I replay the scene. I look for the moment I said one word too many. I decode every shift in the other person's tone. I scroll back through our texts looking for the proof that I made a fool of myself. It is not conscious at first. It runs in the background, like a browser tab eating battery. And whenever I try to focus on something else, it comes right back.

Preventive avoidance. I have ignored invitations because I was sure people did not actually want me there. I have not applied for jobs because I had already imagined the rejection email. I let projects rot, afraid they would disappoint once finished. RSD does not just react when rejection arrives. It reorganizes your life so that rejection has no chance to arrive. That part took me the longest to see.

Over-investment. When someone matters to me, I become too much. Too attentive. Too available. Too accommodating. Not by calculation. By fear that the slightest crack will make the other person leave. Close friends have pointed it out. Past partners too. One of them said: "I do not need you to do all that. I would just like to see you breathe."

Russell Barkley is probably the researcher who has theorized this link best. For him, ADHD is not just a disorder of attention. It is fundamentally a disorder of self-regulation, and self-regulation includes emotional self-regulation. When a strong emotion arrives in an ADHD brain, the system that should modulate it does not do its job. The emotion fires at full volume, unfiltered, and takes longer to fade. Barkley calls it DESR: Deficient Emotional Self-Regulation.

Shaw, Stringaris, Nigg and Leibenluft published in 2014 in the American Journal of Psychiatry a review arguing for emotional dysregulation to be reintegrated as a core dimension of ADHD, as it was in early clinical definitions before DSM-III. Surman et al. (2011) had already shown that 34 to 70% of adults with ADHD present clinically significant emotional dysregulation, versus 5 to 10% in the general population.

On top of that, there is the personal history. When you have spent your life hearing "you are not trying hard enough," "you could do better if you wanted to," "you are too sensitive," your brain ends up anticipating criticism everywhere. Each interaction becomes a potential trap. It is no longer a reaction to one isolated event. It is a default reading of the social world.

I am also a highly sensitive person in Aron's sense. I process stimuli deeply, saturate quickly, feel the mood of a room like a wave. That is a baseline trait. It modulates my life all the time, not only when something goes wrong.

RSD is a reaction. It has a precise trigger: a rejection signal, real or interpreted. It is more brutal, faster, more painful. I can be HSP on a quiet Sunday afternoon with no trigger at all. RSD never surfaces without an email, a silence, or a critique to set it off.

Many adults with ADHD have both. And the two feed each other. HSP raises the resolution at which I detect ambiguous social signals, so I have more occasions to read rejection where it might not exist. RSD intensifies what I do with that information. Combined, they can make some periods deeply exhausting.

Naming it. Trivial but real. The day I understood that what I was experiencing had a name, and that other people described the exact same mechanisms, I stopped telling myself I was just defective. It does not make RSD disappear. But it changes the way I talk to myself when it shows up.

Methylphenidate. During the four months I was on Ritalin, the effect on RSD was sharper than the effect on attention, paradoxically. The delay between trigger and reaction grew longer. I had time to think before collapsing. Surman et al. (2013) published findings consistent with this: stimulants reduce emotional dysregulation in adults with ADHD.

Labeling in real time. What my therapist calls "labeling." When I feel the wave coming, I say it out loud, or as an explicit thought: "this is RSD firing up." It creates distance. It is not reality, it is a reaction to an interpretation. It does not work every day. But it is one of the rare things that works some days.

Learning to ask. Instead of inventing ten reasons why someone is not replying, ask: "hey, are we good?" It sounds obvious. For someone with RSD, it is almost insurmountable the first few times. But it kills 90% of the false alarms.

My attachment style is still anxious. When I care about someone, RSD wires straight into the attachment system, and the result looks a lot like emotional dependency. I have not figured out how to cut that circuit. What I have figured out is how not to dump it on the other person. There is a real literature on attachment in ADHD (Storebø et al., 2013 in particular), and I keep digging into it.

Professional rejections (a client leaving, a project turned down) still hit hard. Those are the worst because I cannot blame a bad day or a misunderstanding. It is an evaluation of my work, and RSD reads that as an evaluation of my worth. I can know this intellectually. I cannot always feel it.

I have not tried the alpha-2 agonists (clonidine, guanfacine) Dodson recommends for RSD. In France they are not indicated for adult ADHD, so it would be an off-label prescription that none of my psychiatrists has been willing to write. If you read this and you know things I do not, write to me.