RNMOM, don't give up! You have done so very, very well! Look how far you have come!!! Keep it up and do not look back. If nothing else, you know you are healthier and happier, so keep it up for another week and see where you are. I know how upsetting that scale can be, so supplement it's information with info on how your clothes are fitting, how your measurements are, and most importantly, how you FEEL!
Sounds like you are exercising a ton, which is very impressive. This could easily be muscle mass. Just keep doing what you are doing, and if necessary, hit Phase 1 for a little bit.
We're all cheering you on!