I'm coming up for 2.5 years post op soon, and I have developed a couple of post op complications. I have the chronic malabsorption, which means I absorb very little of what I eat. This meant my weight loss was very rapid, but also that it is hard to stop losing. As most people know, to combat this I have to eat a very high fat and high calorie diet, and break all the post op rules such as eating lots of sloppy food, grazing, and drinking with meals. Still, prescription junk food isn't too terrible, and I would rather be this way than struggling to reach target and maintain.
Secondly, like Sally I have reactive hypoglycaemia. This was more of a problem during pregnancy, now its not frequent, I can tell the signs, and its easily reversed with a chocolate bar

followed by some complex carbs. I was not diabetic pre-op.
Not a complication as such, but a post op problem for me has been the excess skin. I thought I was prepared for it mentally etc, but how it affected me came as a huge shock. I literally hate it. However, I am waiting for news on funding to have it removed.
Healthwise, I was complex pre op and I'm still complex post op. BUT, I have normal kidney function for the first time in nearly 20 years. My SLE, IBS and nephritus have all improved. My fibromyalgia, postural hypotension, psoriasis and arthritus have not. The PH has got worse.
Do I regret it? Do i heck! Its one of the best things I have ever done. I only wish I'd done it sooner.