Thanks for your query.Based on the facts that you have posted it appears that you have
been catheterised for draining urine during surgery for Hysterectomy
and getting feeling to empty bladder,
This is nothing bur due to weak spasms of the bladder as foreign body reaction to catheter that is placed in your urethra
If your catheter is to remain for a long time please take Tab Oxybutinine to reduce spasms of bladder.
This feeling will go away after catheter is removed.