Karliy, I was sleeved on 11/29 and I had the same problem. The minute the shake hit my stomach I would immediately become nauseated and vomit. Sometimes I would feel the shake coming up my throat and try to choke it back down because I so desperately needed the protein! Couldn't get my fluids in because of the nausea either and honestly, I still don't get more than maybe 16 oz a day. I've had to tweak my diet a bit to include more water-containing foods, which I know isn't recommended, but I have found mushed up cucumber, cantaloupe and honeydew melons seem to stay down fairly well. I've also added Greek yogurt and lots and lots of tuna fish, which allows me to get the protein in. I know I'm probably going to get a "shame on you!" from some of my friends here, but I simply had to make these changes on my own in order to stay out of the hospital. One thing I can say is that I think you need to up your calories a bit. I know it sounds counter-productive, but I wasn't losing ANY weight when I was getting 300-400 cals. a day. I think if you can try to bump those calories up to around 800-900, that scale is gonna fly! I eat 900 calories a day now, when I can, and I'm losing about a half a pound a day. Slow and steady wins the race, and you're going to win. I promise. Hang in there.