My stress based disorder is cluster headaches and they literally feel like death and all I can say is don't rely on doctors to help, diet changes are not in most western based docs playbooks, drugs which cover up and masks the problems are, try heavily modifying diet, start going into ketosis and see if you feel better after a couple months. It took me 8 years and the best healthcare around to reach this point. Cold shock seems to quite stress/inflammation as well. These things are freely available.
Other non drug alternatives: Meditation, acupuncture, camping, horse back riding, walks, runs, swimming all seem effective at lowering stress as well from my exp.
A friend of mine who had the same also tried everything.
Healthy livestyle in general and meditation are good obviously - but in his case drugs apparently did help: LSD and psybicilin. To let go of some stress inducing thought patterns. ( he did use lots of it for some time) So in his case it was largely a success - but of course it can also go very wrong. So I am not recommending it, just sharing a anecdota of a case where it was helpful. As far as I understood, when you are experiencing cluster headaches - you are willing to try everything, to not experience it again, so all the best to you and anyone else experiencing it.
Other non drug alternatives: Meditation, acupuncture, camping, horse back riding, walks, runs, swimming all seem effective at lowering stress as well from my exp.