I'm concerned about a meal I had about two months now that I doubt it may not be prepared properly. Three weeks ago, I began experiencing diarrhea that only lasted for a day, and then came back at the end of the week. I have been experiencing this till now. Two days a week with diarrhea with stomach pain, especially at the middle of stomach. I was concerned that it may be HIV but fortunately it was not. Then, I am concerned it may be cancer, but I don't know. Any suggestions?