I agree that the fundamental issue is hyperactive sympathetic response.
You need a timeout. Take a break from the forums. Have faith your body will get you better on its own because it will. Casually observe your mind and catch yourself when you are feeling unnecessarily fearful. Eventually, you will become less and less sensitive. If you wake up and feel worse than you did the day before, don't panic.
If you have a problem with nervously scratching at yourself until you bleed, relaxing will help. It'll keep you from scratching, and eventually you'll stop doing it in the future. But you still should put a band-aid on that wound.
If you don't pay attention at crosswalks and end up with a broken leg, you should practice paying better attention. Practicing care doesn't mean that you shouldn't use a crutch while your leg heals.
If you're freaking out and anxious all the time because you overstimulated your stress response, you should calm and relax your stress response system. Should you suffer poor digestion meanwhile, if you don't have to? Take vitamin C, take enzymes. Poor digestion will make it that much harder to ease your stress response, so supplement to take that stress off while you're working on relaxing. Being dehydrated? Drink salty water frequently. Ease up on potassium. Being dehydrated won't help the healing.
B vitamins, Rhodiola rosea, lysine, licorice, small frequent meals, avoiding Sugar spiking, restful sleep, N-acetylcysteine... There are many things that are not directly about "de-clenching" that help our lives be more pleasant, livable, and give us a stronger foundation from which to heal our bodies.
Yes, certainly the fundamental problem is that we've got our stress systems hyper-reactive, and we won't be better unless we solve that problem. But let's not leave out the fact that there's help along the way. No need to struggle anymore uphill than we already are.
For more info on the stress system, look up "LHPA axis".