Hi, I was diagnosed late in life. I have been stuck in fight or flight mode for years now. I’ve finally realized it. It’s a result from a combination of ADHD and PTSD – well, ADHD and having trauma. Things I’ve found helpful that aren’t harmful (there are ways to avoid/to relax that aren’t healthy, but here are some healthy ones): massage, meditation (long ago I would have said “never for me”, some medications (lately, ketamine nose spray has really made a difference), therapy, and baths with the shower on. I hope you find relief.