ive had some terrible times   ive used a feature of my adhd to hyperfocus on another ideaprojecttask and for a time forget what was making me upset  this lets me clear my head and when i remember the bad incident again i try to process it calmly a bit at a time when i feel myself hyperfocusing again on anger sadness fear etc i repeat the redirection again  it takes fucktons of practice but its helped me remain functional instead of hitting brain-lock where everything keeps looping back to the trauma