I think that is great. I had my surgery on June 16 and I am down 65 lbs as of now. I was one of the luck ones that did not experience any side affects at all. However, you will do fine and some of the challenges you will face after surgery is you will notice how much food is a focus on everything you do. DO NOT let that get you discouraged, it is just a phase and that too will pass.
For example, I was one week out of surgery and the family wanted to go eat bar-b-que, well I did not want to go in the first place and I ended up going anyway. I sipped on tea and bean juice, it was not that bad. Just remember your goals and keep true to them and flourish as you lose weight, towards a new life.
Hang in there... your new life starts in a few days....