Well,
If you have had a fever after surgery, and your doctor is unconcerned, I would find a new MD FAST!!!!!
Post surgical patients, especially major surgery like a Hysterectomy, and having opened your body cavity up, are, in my experience, watched like a hawk.
When you say a fever, do you mean you have taken your temperature with a thermometer, and it is elevated above 98.6? Because you do not technically have a fever, if you do not take your temp.