My daughter (4) just had sinus surgery at the end of February. She was asleep, it took longer than expected bc her sinuses were bulging from infection and she had a polyp that almost filled an entire cavity. She was on round the clock tylenol/motrin with a fever (which is normal) for 5 days. Her main complaint was that her neck was sore. Apparently called referred pain, the pain can be referred to the neck. That was suprising. She feels MUCH better now, is glad she can breath, smell, etc and is very willing to do twice daily sinus rinses in hopes of avoiding this again!
I am sure the thought of the surgery isn't real exciting but the feeling better part will be great! Good luck with your surgery!