I have horrible IBS-D and anxiety. I started nortriptyline 3 days ago and I have had some side effects such as: headache, nausea, numbness, chills, and the main one being worse diarrhea. Will the diarrhea improve as my body adjusts or is this a side effect that I should stop taking it? I called the GI but I haven’t gotten a response yet. It has helped with the some of the pain.