I am a nurse, and I had gastric bypass (Roux n Y) in 2003. I have type II diabetes and was taking huge amounts of insulin. I weighed just under 300 lbs. I had developed the first signs of neuropathy in my legs ad my doctor said, if I didn't want to end up with severe complications, I had 2 choices, go on the insulin pump, or lose the weight. The surgery was a breeze, less painful than the gall-bladder removal I'd had the year before. The first few weeks were hell, as far as the diet is concerned, but then it wasn't so bad.
I NEVER felt hungry, which I hadn't even known was an effect of the surgery! Within 8 months I'd lost nearly 100 lbs! My diabetes was virtually gone. A weird part of it was that I couldn't see the weight loss in myself. I would look in the mirror and not see any difference. I actually had to ask a couple people very close to me, "am I still a fat person? If you saw me on the street, would you see me as a fat person, or just normal?" It was weird. It was this whole body image thing, and it started to fade after a while.
I spent about 6 months at this weight, and then it started coming back on. Now, I weigh 225, only about 50 lbs. less than I had originally. My diabetes is back, and I look like a "fat person" again. When I look back at that breif time in my life when I was at a normal weight, it seems like it was all a dream. I only have a couple photos of myself at that time, and now when I look at them, I just want to cry.
Part of the problem was my own fault. I never experienced the "dumping syndrome" that you've probably heard so much about, and I gradually started eating sweets again. I also had a complication right after the surgery that resulted in A LOT of vomiting, which stretched out one of the newly narrowed valves, allowing more food to pass through. This is gonna sound crazy, but as fleeting as it was, that short time at a normal weight was worth the whole ordeal. (I have been overweight since early childhood, and had never had the chance to just feel "normal") So my advice to you is, go for it! Have the surgery and do eveything they tell you to. But the second you start to feel like you might be losing control, talk to your Dr., nutritionist or whoever. Don't throw away your chance at a new life, like I did.
Good Luck To You