No no no !! You did not mess up. Your body is going through alot of changes right now and has to have time to catch up with everything that is happening to it. Dont be discouraged!!! Stick with your program and you will be fine, the weight loss will come.Talk to your doctor about walking a little more everyday. I understand that you have heart problems but even if its just a stroll down the street its better than nothing.I am at five weeks post op and I have had my own struggles as well. I lost 30 pounds pre op and the first week after surgery 10 pounds fell right off. Then wham! Nothing for two weeks. I was so discouraged and upset. But I read alot of posts and here and found out it was normal to hit a stall. Discouraging as it may be , we all go through it. I am kinda afraid that I hit another stall this week. I lost five pounds last week and for the last three days the scales have not moved but I know as long as I keep at it the weight loss will come. Same for you!!! Just dont give up. This is a process. Good luck!!