Frustrating GI appointment

The GI said I have the classic symptoms of IBS, that gastroscopy and endoscopy were normal. He wants me to try eating bran buds. Starting slowly and increasing the amount gradually over time. My next appointment isn't until December 22nd. He said not everyone can get to the full prescribed amount of bran. He said that when I come back if I still have pain he would prescribe a very low dose anti-depressant that helps someone not care about the pain. Not sure about that pill or about the bran buds. Kind of frustrated because he was in a hurry to get me out of the office so I felt rushed. This pain is really wearing me down. It's hard to not get depressed over this and feel like it will never get better.