Not losing weight anymore

Hey everyone,

So I have not lost any weight in about 5 or so days and prior to that it was only a pound. Previously I had been losing a pound a day but now I am just stuck. I am 6 ish weeks out and still following the meal plan. I am working out and keeping my calories at about 500 which is suggested. I know I am not drinking enough water or getting enough protein. I am just focused on calories because my dietician said I wasn't getting enough in. Should I change my focus to protein maybe? It is just really frustrating to be stuck at this weight when I feel like I am doing everything right.

Does anyone else have this problem? What did you do? I have a goal of losing 15 pounds in the next 6 weeks for a trip I am taking. I'd really like to fit into my clothes comfortably, ya know. Maybe I'll just go back to shakes and water?

Thanks for your time and your input.