Try to get a perscription for LOMOTIL it is a opiate and it has worked great for me when I had diahrea. Do you take any probiotics?
Renew Life Ultimate Flora Critical Care is a great probiotic and I take 2 a day on an empty stomach works great for diahrea. I buy it from the health food store in the refridgerator. You should notice a difference after a few days.
Do you take any metamucil?(Fibre) Metamucil helps to bulk up the stool. Don't take the sugar free one I think the sugar substitutes cause more problems especially diahrea.