I had a lot of hair loss after surgery. My hair grows slowly, and the loss was most evident about 6 months post-op. My hairdresser said that it's common after anesthesia, and, SRS is a long surgery with lots of anesthesia. I also had a yeast infection post-op that was a big setback.
The good news is that, a year later, my hair was thicker than ever, no problems since.