i am not a doctor but it sounds to me it could be a gall bladder issue.
PLEASE PLEASE PLEASE follow your "gut" feelings on this. I will not go through all the horrific details but I am a survivor of an appendectomy gone bad. If I stayed with the same surgeon, I would be dead. I have had to have 8 surgeries to correct the doctors error (he left the stump of my appendix in) which went unnoticed by him for 11 weeks. I finally went to a top hospital 1 hour away where they started to fix me. 2 1/2 years later I am still having surgery to repair my abdominal wall. I have also been on Keflex as I contracted Cellulitus in my abdomen. I just had my gall bladder removed and the funny thing is that I have had a diseased gall bladder but no test over the 2 1/2 years picked that up.
If your doctors aren't helping you, find someone else. Find another doctor, go to a very reputable hospital and don't ever doubt yourself. You need to be VERY vocal, even if you are on the verge of obnoxious. Remember, this is your life.
I would be interested if you post again to follow up.. Prayers and well wishes