Ben:
Everybody here gave you great advice, especially Cruella.
I've been in the medical field for a long time (medical transcription and now quality control of the same), and I've typed and reviewed thousands of hysterectomy surgeries and followup reports over the years. My point?
What you are experiencing happens to some women. Surgical menopause? YES! Very real phenomenon. My wife experienced it bigtime years ago. Major bummer for her. Hey, a short while back, I "hit the wall" on my own HRT and stopped estrogen cold for about a week. I had night sweats, hot flashes, couldn't sleep. Yes, you are facing surgical menopause ... and everything else the people above mentioned.
The good news is that you WILL pull through it all! Just take it one day at a time! It really will get better for you, so just hang in there!