And if it is dysautonomia, isn't that possibly caused by mast cell degranulation? I've had several issues that from what I can tell are dysautonomia-related (laryngospasm, proctalgia fugax, swallowing difficulty, breathlessness and significant rise in heart rate upon very minor exertion, lightheadedness upon standing, waking up gasping for breath, "exploding head syndrome" right before or as I'm falling asleep, etc.), but now these are all rare or gone, and if they are still present and rare, they are not as pronounced, that is, after taking meds and supplements designed to deal with MCAS.
I'll also mention my GI med history: "colitis" as infant (1960s), "pre-colitis" as teenager (I had a little pill box with a couple of Lomotil pills in it that I always carried around). In college, age 19, I developed food poisoning type symptoms when I ate fried food (I didn't make the connection at the time), so I tried a vegetarian diet, then quickly switched to vegan, but still had that problem if I ate something like fried falafel. In late 1999, I developed a wasting disorder, characterized by significant weight loss in a short period of time after one of these food poisoning type incidents, usually after eating at a restaurant (no fried food and vegan). During this time I alo had bloating. I eventually thought it might be low stomach acid, because I had never experienced acid reflux (it was just like water when I had reflux), so I took Betaine HCl and in less than a year this was resolved. Since then, no major GI problems. I have noticed that whenever I eat something new, even if I ate it several days earlier (apple sauce is one "benign" example), I will often have to urinate in the middle of the night, whereas if I eat the same items as I did the previous day, I can easily get through the night without urinating (10 hours or more); I wrote up a thread about that a couple months ago, for those interested.