I have had pain in my stomach since the end of May and its not going away. I have a lot of gas. I mostly have diarrhea, no hardness. My stomach pains seem to come for 5-10 minutes and will go away for a few hours then return. I have been losing weight and have had no appetite. I had went to the doctor for having a sever back pain and constipation was the cause and i had to take milk of magnesium for it. I am currently taking Nexium with my food that I do eat. Any suggestions to what could be causing this?