Try taking probiotic supplements. I had chronic diarrhea for 2 years and everyone told me it was my nerves, but a month or so after taking probiotic supplements it's gone. If I stop taking them for a few days it will come back, but I guess it just takes time for your body to rebuild a healthy bacterial balance. I use a brand called PB-8 and take one pill in the morning on and empty stomach and one before I go to bed at night.