Recently diagnosed with Lymphocytic colitis. Treating with Pepto Bismol. Will this flareup go away and will I be able to eat those foods that are trigger foods for me right now? how long does it take for a flareup to go away. I have had this for going on 3 months. One of my symptoms is that I am really tired. Are you? Thanks for your help,. The dr's don't seem like this is a big deal. My daughter insists that I change my diet.