For the past 6 months, I ve had nothing but diarrhea. I ve changed my diet, cut out fast food and greasy food, even went on a liquid shake diet, and still it s not solid. I m not in any pain or anything like that, but I did have a cold one week and so I took pepto bismal to relieve my vommitting, and that was the only solid poop I ve had that I can remember. It changes color daily, sometimes being brown, others green, others reddish. Do I have some kind of illness? Should I be worried?