I completed a Whole30 a few weeks ago and until Sunday I had not reintroduced any forbidden foods, except for occasional small amounts of cane sugar, and at least one serving of non-compliant oil.
On Sunday I purposely consumed wheat as my first official reintro. I didn't start the reintroduction until around dinner time, so I ate several servings of wheat at once, in the form of two pieces of bread, a small serving of pasta, and a serving of pot roast cooked in a beer-based sauce. Since that meal, I have returned to Whole30 eating.
Sunday evening I noticed a headache but this did not surprise me since I often have tension headaches. However, not only has the headache continued on and off since then, but it has been accompanied by intermittent nausea ranging from mild to quite bad this morning. Interestingly, eating (Whole30 meals) seems to help with the symptoms.
I have no history of migraines. Is it possible that there is a connection between the wheat and my intermittent headaches and nausea? If so, is it unsurprising that I would still be experiencing these effects almost three days out?