I have had diarrhea for 2 weeks since home repair (ceilings) no diet changes. Better last weekend when I was out of town. Back now. What is it?

Doctor can evaluate. Colon or rectum symptoms, or diarrhea, can be due to irritation (inflammation) or infection. Symptoms can occur from Giardia infections, infectious viruses or bacteria, inflammatory bowel, celiac disease, etc... Lactose intolerance, or eating excess fruits or sugarfree sweeteners like maltitol or sorbitol, can also cause symptoms. A primary care doctor, or a G.I. doctor, can evaluate and do tests.