How many calories is enough to lose weight on?

I had nonadjustable banding on 3-14-2000. I lost almost fifty pounds in the first two months. Now I have not lost in almost three weeks. I have a protein bar or shake for breakfast and try to eat a can of tune for lunch and either, fish, chicken or very lean ground sirloin for dinner. I am on a no carb. diet and stick to it with a passion. I also try to limit the no. of grams of fat. I seldom eat over 500 ca. My doctor limits liquids including H2O to 2oz/hr to keep the pouch from stretching. Even with this limited amout of fluids I have H2O retention problems. I am now on lasix. I use a treadmill for an hour a day. My ketosis strips are no longer changing color since I started on lasix. If this is all I'm going to lose then I spent an awful lot of money to just lose 50 lbs. I want to know what I am doing wrong and what I need to do to fix this situation. If it's not going to change then I also need to know that so I can make plans to have another type of surgery like RNY. I will not live my life fat after being very thin (110lbs) up until five years ago. I feel like I have been lied to and made a fool of. My surgeon basically has no aftercare and tells his patients to just follow the diet and everything will take care of itself. I live in a small town and there are no doctors here that deal with this type of problem. I am truly desperate and need help. I wonder if the fact that I starved my body all my life to stay thin is causing this problem I am experiencing. I also used to throw up on a regular basis and it is getting very hard not to do this again. Anyone who has any real experience with this problem please give me an answer.

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