I hear so many comments that neutering is a simple procedure, no biggie. When in fact it's very invasive with a longer recovery than portrayed by some. My boy was neutered at 3 last summer for an ongoing prostate issue. I'm happy to report the prostate issue is no more but it took a lot longer for him to heal. I know he was very uncomfortable during that time. It was hard keeping him on down time.
I hope your boy starts to heal faster. I honestly just crated him, took him out on the leash. I found it easier than trying to entertain him. If he was in his crate he knew it was time to just rest. Good luck.