Diet mostly, I dropped most added sugars, wheat and drip coffee (french press and cold press are fine for some reason) along with broccoli (random, right?) and industrial breads (something in the rising agents ¯\_(ツ)_/¯ ) and I'm currently mostly fine.

Large amounts of red meat is bad, because it just doesn't digest properly, I might burp in the evening and still taste my lunch sausage...

Metamizole is the only one that helps in the extreme cases (panic attacks), but luckily I don't get those anymore. I think I've had to take a single pill twice in the last 5 years. It's pretty much exactly 15 minutes from swallowing the pill and then all symptoms go away because it forces my diaphragm to relax and thus drop pressure to the vagus nerve.