in the last few months i have put on a lot of weight, i have bouts of diarrea bloating tiredneaa and mouth ulsers, i have had a fasting blood test to check my cell count thyroid and to test to see if i am diabetic but they all came back clear. I also bring up alot of gas and have heart burn . My doctor doesant seem very interested in finding out what the problem is but i would really like to know what it is and how i can make it better.