Hi welcome to HCM... As per your history yes you have functional bowel disease that is irritable bowl syndrome.... Symptomatic management done... While diarrhea maintain hydration with more water and probiotic taken.... While in constipation stool softener or fiber food like whole grain , wheat bran , apple taken.... Ginger tea useful.... Meanwhile kiwi like fruit taken.It is rich in linolenic acid , vitamin c , vitamin e , magnesium etc... Avoid smoking. Avocados and cooked oatmeal good one. As far as specific drug concerned Two drug available..... -lubiprostone -alosetron... Take care.... Dr.Parth