How long was it since your colonoscopy was done? How long since the stool tests were done?

There is no way to say what the cause is because there are many different causes. Have you ever been told that you have irritable bowel syndrome? Are you or have you ever been an alcoholic? What is your diet like? Has your diet changed recently? Have you lost weight? Did they ever check you for clostridium difficile?

The only thing that I could really advise you try is eat yogurt with probiotics. Activia claims to be high in bacterial cultures and they fix your bowels within two weeks or your money back. I'm pretty sure it is Activia that says that but I might be wrong. You also can get bacterial cultures in a capsule. I had diarrhea for several months after being on three different antibiotics upset the balance in my intestines and my doctor suggested the capsule but I can't recall the name at the moment. A pharmacist should be able to recommend one for you.

If the bacterial cultures don't help I would suggest discussing the problem with your physician. It could be something simple or it could be complex. Hope you feel better.