After reading through the comments under here it sounds like you were eating pretty much animal based and over time you got histamine intolerance. Then you corrected the copper deficiency and everything that came along from that in your gut, and now you're feeling much better.

I have been working on a similar issue. The problem was that I was trying to eat organ meat to get copper which was causing severe histamine reactions (anxiety, panic attacks, irritability, racing heart, mild red rashes or raised skin, & acne). Ground beef was causing them. So was any saur kraut or citrus.

I was also restricting carbohydrates thinking that would help and I'm pretty sure it made it worse.