Some people become allergic or intolerant of eggs. This is because eggs were a foundation for the manufacture of vaccines.

Also an uncommon condition called hereditary angioedema can be triggered by eggs (and also fresh fruit).
So far I can tolerate some fruits a little bit (apples and pears are out), and a few eggs/week. I was newly diagnosed with this late in life, after a common blood pressure drug, lisinopril, gave me a serious angioedema spell.

Coffee and tea have caffeine...but also tannins which are acidic.
They also trigger serotonin in the GI tract and some people are sensitive to this. Serotonin will increase gastric and intestinal motility.

When changing your food to a new style of eating, be patient. It takes time for you to learn and implement eating a new way.

The food enhancer MSG will stimulate the NMDA pain receptors, and so will Nutrasweet which has aspartate in it. This is why people with nerve pain should avoid them in processed foods.

Since you have recently had a spell of pain, I'd pay attention to what you crave now, and what you did on a daily basis, and what you ate each day to see if anything sticks out. The way many food intolerances work, is that they make you crave what is actually causing you problems. Reaching for that hot sauce or tomato based food all the time, alcohol, sodas, orange juice gluttony, candy bars...etc, are hints to avoid for a while.

What others eat or can tolerate, doesn't really pertain to you. Your reality may be that you have a virus infection, which will remit in time, leaving you in better shape. So the diet changes at this point are only for future maintenance, etc.

Also tramadol may not be effective at 12.5mg. 25mg does work for me. Tramadol is not instantly effective either. It has to be activated by the liver to its metabolite which is what is actually working for pain. So taking it may need 2 to 3 hrs to see any effectiveness. People taking high doses of it regularly, reach a steady state and do not notice this delay.