I also expected to be falling out of my clothes after surgery, but the reality was, I was pretty much TOO FAT for the clothes I WAS wearing-- so the first big amount of "shrinkage" just meant that I began to PROPERLY fit into my clothes again.
Now I am down 50 lbs., and it's finally time to start going down some sizes.
On a side note, if you are only taking in 800-900 calories and you're exercising 5 times a week, it could be that you aren't getting in ENOUGH calories. Our program nutritionist doesn't want us getting in less than 800 calories a day, and you're very close to that. So maybe that has something to do with things...