I had UC for 7 months before it ate a hole in my colon and I had emergancy surgery. I lost 60lbs and was completely miserable no matter what diet I was on or drugs I was taking. I sometimes get bummed about it my bag, but quickly think back to how miserable I was before. It was so worth it for me! I have had my bag for almost 3 months now. I just got back from vacation where I did all kinds of activities including swimming and hiking. That was probably the best test for my bag. It did almost come off when I went down the waterslide head first and smashed my stomach into the water, but it was fine being in the water for long periods of time without any leakage. I haven't had any problems with leakage yet.
I was in the hospital for 10 days after surgery and was at home for another two weeks before returning to work. Seven weeks post surgery I played 72 holes of golf in 3 days, walking all the rounds. I was tired and sore, but it felt great to be so active for the first time in months!
Good luck at your Dr.'s appt.