I was sleeved a week and 2 days ago. When I stepped on the scale I was excited and shocked to see I have lost 18 lbs. I am having a little bit of trouble with protein (liquid in, liquid out). I was curious if others experienced the same type of weight loss in the week following surgery?

Good for you! The first two weeks you tend to drop a lot of water weight. Depending on your weight, they say the first 10-20 lbs is water weight. It's normal. Then it slows down to about 1-5 lbs per week. Make sure you get that protein in though, and plenty of liquids. You don't want to end up dehydrated and with your hair falling out. I, for one, was getting maybe 20 oz of water in a day (counting 2 protein shakes made with water) and started getting very dizzy and strong migraines...I was getting dehydrated really bad. I upped my water intake using lemon ice tea crystal light, because water tasted gross to me after surgery, and I began to feel better within a day.

Yup. I came home from the hospital at 9 days post-op (I had non-surgical complications) and when I weighed myself a week later I was down 19 pounds. I was worried I wouldn't lose any more weight after I came home, but in my second month I was down another 10 pounds.