What Is The Remedy For Week Anal Muscles And Diarrhea?

Hi. I have had upper GI test which shows medium hiatal hernia and a colonoscopy that showed a polyp which was removed in the procedure in the last 18 months. The latter test was my second in 10 years and in the last 3 years I have experienced weakened anal muscles and bouts of diarrhea. I have been using Prilosec daily for feelings of nausea, acid reflux, prescribed by my primary care physician over the last 3 years. I am 75, but active going gardening, walking, etc. I weigh 155 pounds, medium frame, and have lost and regained no more than 5 lbs over the last 5 years. Do I need to see a gastroenterologist or deal with this by eating smaller meals and different foods? I am a woman.