Okay so Since about a year ago, i have been having major issues with my stomach. There was a doctor who prescribed me a medication for an STD when I had a cold (***?) and since then, i can not longer have milk (Only milk, other dairy seems okay..) So lately, I have noticed that after about three months, my stomach problems have returned. Every time after I eat, sometimes immediately and sometimes an hour or so, I get diarrhea and a stomach ache that makes my stomach almost feel like its burning and is extremely uncomfortable.

I have tried cutting all dairy out, but it made no difference. I am a teen, female, and extremely annoyed with this problem. I have gone to see a doctor, but she didn't order any tests or anything, just said to take zantac (because I have GERD) and it will go away. But zantac also upsets my stomach, so that is not an option. I need help, majorly, and would appreciate anything anyone knows!! thank you!!
PS. I'm new to this, so i may be doing something wrong and not notice :P