Have you ever looked into food sensitivities/intolerances from grains, legumes etc? Also food chemical reactions, like amines etc?

Some links:

The Gluten File
Food Allergy and Intolerance
Food Additives (FAILSAFE)

I'm former lacto/ovo veg and it took me ages to figure out what my problem was (gluten and soy, used to be dairy too but it seems to be fine now). Hope you figure it all out and find the relief you deserve It really can get overwhelming.