Still Waiting.....

I know some of you mitte have seen my previous post on forums just thought i would rant and rave a little. I am 6 weeks post op and am doing everything as instructed by my doctors. I lost 20lbs first 2 weeks of surgery the last 4 weeks i have been at a complete stall well not stall cause i have managed to gain 6 lbs back wth!!. I have heard about the dreaded 3 week stall but this has been going on for 4 weeks, i contacted the doctors office and they could not explain why i havent lost. i take to protein as i am suppose to , eat protein first keep in mind i am still only getting about 500 calories a day, I excerice daily .The doc said even a weeks worth of food doesnt add to a pound. I really was hoping to have lost 25-30 lbs by now amd i have a BMI of 54 so i have alot more to lose. i lost 73 lbs on my own pre surgery . Has anyone heard of this ? well i am hoping that next week gets better. I only weight weekly , fingers crossed i can get threw this. I am trying to up calories as instructed by doc to 800. I love hearing people success stories just it seems like i am waiting on my own.......