Hi all!I was just prescribed Amitriptyline by my gastroenterologist for IBS. A little background: I became really irregular in December '09, frequent bms, cramping, mucus, etc. I've had multiple stool samples and a colonoscopy to eliminate Chron's, UC, and any bacterial infections. I've tried flagyl and suppositories with no improvement. I was diagnosed with IBS in March '08 and my doctor thinks that this must be a long bout of it. I can't believe I used to complain about IBS before! I don't think it ever lasted more than a few hours at a time back then, now it's all day, every day for months.I'm a bit anxious about the posts on weight gain as I'm already bloated and struggling to fit into my clothes. I'm starting on 12.5 mg and moving up to 25 mg in a few weeks if there is no change. Anyone have personal stories on this? Is the higher dose more likely to cause weight gain? I'm conscious of my diet so I'm hoping that the weight gain is just a result of increased appetite rather than an unavoidable side effect. Thanks so much!!!!!!