eaten ham?

Could it be (if it is the processed type - slices) that you are having a reaction to either the nitrites or the sugar brine it may be made with? (just a suggestion).

Could it be the cheese, as well? Are you having any kind of reaction to things you haven't eaten before, or for a long time (allergies cropping up you were unaware of)?

Try tuna, salmon, things like that, perhaps.

Possibly some herbal tea (especially with mint) may help settle things down for you.

I wish you well. I know it can be a big struggle to fight against the body rebellion when you choose to eat differently (like trying to overcome bad habits).