I have been having blood in stool, had galbladder out. i have ms, dont take any narcotics. i eat healthy foods, what could be reason?

Several reasons: starting from the anus and rectum, all the way up to your mouth. Nature of blood: is it fresh, blood clots, dark stools, or black tarry stools? other symptoms as pain, urgency, spasms, etc. Better see your doctor for evaluation and referral to gastroenterologist if needed, most of time, it is something minor and would resolve, best wishes