It can take days to completely eliminate the med given. It's unusual to have lasting effects from the commonly used anesthetics. I'd give it a few more days before taking further action.
BTW, there are hormone levels that are reduced after a neuter, but I've never seen this type of behavior reported.
Doug, DVM
Doug & Sandy
Kaylee
Winnie 6 1/2 year old golden
2008 Southwind 2009 Honda CRV