first off... WELCOME!!!
I have a girl so i don't know FIRST hand but when Layla got spayed she didn't want to eat or drink... i would put water on my finger in hopes that she would lick it off.. and she did.. and i also had to hold her up to go pee... she was THAT drowsy!! it was sad. lol... so don't worry he sounds normal!!! tomorrow he will still probbaly be very groggy but you will notice he is much better! watch those stiches... you might want to go get a baby onesie to put on him so he doens't lick at them.
This is Layla in her onesie in case you arne't sure what i am talking about