I had a full hysterectomy when I was 48 years old. Although initially I was on hormone replacement I stopped it and felt alot better without the pills. This is not the case for everyone but this is how it worked out for me.
The operation itself was quite easy to recover from. My recovery was complicated by a UTI from the catheter but all in all it was fine.
I never had a hot flash before or since the operation. Again, each woman is unique. This is just my experience.
I wish you a safe surgery and a healthy, full recovery.