I was sleeved on July 26th... I have no pain. I feel if you're a bigger person though, the tools have to go deeper and do more damage. This is my experience in the years I've been a nurse. I had a low BMI, started at 208, and down to 181. I have lost 27lbs in 4 weeks. I don't have a lot of energy like you say you do, but relatively no pain.