Hi CantThink~ I ate just a small amount of the bell pepper and onion. I've eaten very small amounts of those before without a significant issue (eg: what I experienced after the meal). I have had the same symptoms (even worse) after eating other animal foods (and high histamine foods), so I suspect it was the chicken.
Yes, my meals are pretty boring, and I have ordered just lettuce and chicken or fish at restaurants before.
But, my life has improved greatly with the rather restrictive dietary changes so it is worth it. Even my husband can see the difference in me (my neighbors too---one commented just yesterday about how energetic I seemed--and that was with my having a cold!)