How are you now...I have had the same problem and I would like to know how you are ? I hope you are up Twirling and dancing as I would like to be if this ever goes away :)
It does sound like your sciatic nerve. Have you been sitting a lot since your surgery? I would recommend seeing a Chiropractor, but your only 4 weeks post surgery so you have to wait to do that.
If you feel like it could be related to your surgery and your current Dr will not do anything for you then see another Gynecologist.