I clicked on the link you posted listing migraine-unsafe foods. I guess, overall, veganism is doing you a lot of good: milk, meat, and eggs are all on the list of things to steer clear of.
Unfortunately, it also lists onions- and I was wondering if garlic is also a problem for you, being that the two are related botanically. I don't know much about teriyaki sauce; I just figured it had garlic in it. I love soy, but maybe you don't... and anyway, at least some soy sauces contain wheat, which is on the list of triggers.
Peasant (1963-1972) and Fluffy (1970s?-1982- I think of you as 'Ambrose' now)- Your spirits outshone some humans I have known. Be happy forever.