Completely agree with Robrich, diet is important. I suggest getting back to basics. Start with liquids, broths, jellos, smoothies (without raw fruit, I suggest Kefir in dairy/yogurt section), ensure. Give your intestines a rest, then slowly start adding in bland items such as pasta, rice, unbreaded chicken breast, etc. Keep a log of what you eat and how you feel each day.
Make sure to take multi vitamins. Gummies work best for me. Good luck!