4 month plateau ! Am I out of luck and done loosing

Hi, My name is Amy. I had surgery 9/11/02 and my starting weight was 420 lbs. I am now at 272 lbs and have been since the third week of September. I am drinking the protein shakes and eating 90 % protein, but I am not loosing anything. WHAT SHOULD I DO?!?!?! I had the gastric bypass. I don't know what else to do. I read somewhere that once you are 15 months out you stop loosing and this is driving me crazy because I still want to loose another 75 to 100 lbs, before I will be happy with myself. If anyone has any help, suggestions or support please email me. I was planning on going to the doctor next month to see what was wrong with me, but now I am wondering if it is even worth it. Amy Lemmert [email protected] (308) 386-2721 Please help me!