Do not send anything
Whatever is composed, do not send it for twenty minutes. Most of what this state produces does not survive twenty minutes, and almost none of it can be taken back.
Control is the word almost everyone arrives with and it is the wrong target. You cannot decide not to feel something. What is available is a gap between the feeling and what you do about it — and that gap can be built.

The most common reason skills appear not to work is using the wrong one for the intensity you are actually at.
If you are somewhere in the middle of it right now, this is the order.
Whatever is composed, do not send it for twenty minutes. Most of what this state produces does not survive twenty minutes, and almost none of it can be taken back.
Cold water on the face and wrists, or something cold held in both hands. Fastest available intervention, requires no concentration, and works at a level where nothing reflective does.
Stairs, press-ups, a fast walk. Enough to make breathing difficult. This burns off the physiological charge the emotion is running on — the mechanism is literal rather than metaphorical.
In for four, out for six or eight. The exhale does the work. Do not try to breathe deeply; over-breathing is part of what is happening.
Angry, ashamed, afraid, hurt. Only now — naming requires capacity that was not available five minutes ago. Getting from 'bad' to a specific word is what makes the next decision possible.
Where to go on this site, depending on what you are actually dealing with.
Emotional intensity on its own is a trait rather than a disorder. What distinguishes something worth assessing is cost and persistence — years rather than months, and real damage to relationships, work or safety. There is a fourteen-statement checklist on this site if you want something more specific than an impression.
Almost always because they were used above the line where thinking is unavailable. Learn two purely physical interventions for above that line, and the problem largely resolves. This is the most common single misunderstanding in all of this.
Recognition in weeks. A reliable gap between feeling and action in months. Fewer episodes takes considerably longer, and duration shortens well before intensity does — which is why progress often feels like nothing.
If one relationship is consuming everything, the favorite-person guide. If it is the speed of the escalation, the emotional dysregulation guide. If it is what to do at the peak, distress tolerance. Start with what is loudest rather than at the beginning.
No. The skills are not diagnosis-specific and none of them require a label to work.
Then stop reading and contact someone. The crisis page lists free confidential lines that answer immediately, wherever you are.