10 lbs gain

I could scream the next time someone tells me what I should be eating. I have been a nurse for 10 years I know what im suppose to eat . I know what you should eat if you are a diabetic I know how protein works I have a lap band and if you ever had a question about protein someone who had bariatric surgery is a  professor at it. I have gained 10 lbs from my blood sugar going low and trying to get it up. 2 months 10 lbs !  I make myself eat when im not hungry because im suppose to eat every 2-4 hours to try and keep it from dropping. NO I am not just eating junk food I have milk, peanut butter, lean meats chicken. obviously I am eating and not starving or skipping meals. For the love of god my sugar is not dropping because of what I eat when I eat it or how much I eat. it doesn't matter what I do some days its ok the next its not. obviously I am producing too much insulin which causes weight gain. for someone who struggled to lose 75 lbs and now have gained a total of 25lb back I feel like a total failure.