Amb Lyn is right. Just rediscover your modivation. Remember how good it felt to lose that first 4 lbs and keep reaching. It's hard when you get into a slump, but don't quit. Discover what made you want it in the first place and don't get discouraged. We all have our set-backs. I had surgery at the beginning of May. I went into surgery 166 lbs. Couldn't work out for 2 weeks. I gained some weight plus I swelled up like a blow fish near my incision. But After those two weeks, I got really comfy just "not doing it", but then I looked at my son. I looked at my fat clothes. I looked at myself in the mirror and said, rest time is over, get back in the game. I am so much healthier now than I ever was. I am in control. I call the shots.
I am 150 lbs 2 months later. I have 25 to go. I wish I was as far along as you are!

Just hang in there. Keep it up and it will pay off. Keep your eyes on the prize.