I used to be able to have a drink or two....NOW I do not DARE drink, lest I get extremely ill.

You may want to check out 'Cyclical Vomiting Syndrome' it is basically an abdominal migraine....this is all 'Autonomic Storm' in my opinion. Migraines are associated with dysautonomia. I imagine this is all on a spectrum with some of us having overt PN and severe autonomic symptoms, and others with 'migraine'.

With my 'headaches' my entire upper body gets nailed. From the collar bones up, the muscles are hard as a rock and exquisitely tender to touch for days afterwards...up to a week. Then of course, the puking splits your ribs. Your case is very similar to mine....except I have an elevated ANA....which you may still get.