So frustrated

You are doing exactly what you should be doing.  Most of us have been there and this too shall pass, but you are going to feel like it won't, and your mind will try to  convince yout hat you are the one person who is going to fail.  At least mine did.  I don't recall how long my stall lasted.

Keep on keeping on and your body will catch up with the shock.  

It's called a stall for a reason! Just relax! Do everything you should & stay away from your scale for a week! Pay attention to how your clothes feel and how your body feels and is responding! Trust me, four months from now you'll look back and think what stall.