Up and Down, Up and down like a fiddlers elbow

my weight - doing my head in. I start back on SW do a good day and ruin it on the night. Or have a bad day and a good evening. Consequently I am up and down the same 3lb's every week. Doing my head in now. I really want to be back at 12 stone for Saturday when I rejoin SW - so that means losing 2lb's in 3 days - I know I can do it. AND I WILL. Will report back later. tee hee.