I'm 24, back home after 2 years of living in Mexico. I've had abdominal discomfort, nausea and a sensation of fullness in my bladder for about 6 months now. Long story short - an infectious disease specialist found no parasites or anything abnormal in my stool/blood samples. I have already taken a course of the antibiotics for Giardia and so he has given me Donnatal for the symptoms but I am debating even taking it as the side effects seem like they could really worsen symptoms I already have: extreme fatigue, weakness, stress/mild depression. He told me that my only other option was to see an a gastroenterologist for something more invasive. Does anyone recommend the Donnatal? Do I need a gastroenterologist? Please HELP!