P.M.
In addition to avoiding certain foods, like citrus and anything in the nightshade family (tomato, potato, eggplant, peppers and sauces made from these), you might want to add in sources of omega 3 oils, including fish and nuts (especially walnuts), and sources of turmeric, such as curries, or even taking turmeric in capsule form.
Eat a balanced diet, and avoid refined or concentrated sugar sources. Lots of fiber is generally good, but too much is hard on some people's digestive system. It often works to gradually increase the fiber in your diet over a month or two.
It helps when I avoid coffee and alcoholic beverages. I drink lots of fresh, clean water!
Google "anti-inflammatory diet" for lots of tips. Good luck – I hope you find a new level of health.