first things first - THROW THE SCALE AWAY!
I weigh myself about once a month. I don't care what the scale says, as long as its not a bigger number than it was the previous month.
If you want to break a stall, I found the easiest way is to start over. Do an expedited post-op. Go back to liquids, purees, mushies, protein. Lose the carbs, up the calories and kick up the exercise!