It is extremely common to wrongly-sex rabbits. Honestly, even experienced vets and care takers make mistakes because it’s just such a nuanced difference between the two, parts grow at different rates, and there’s so much fur there, so your story is actually quite common! Don’t feel bad or embarrassed.
After a neuter, it is important to limit free-roam space and limit access to jumping/hopping around a lot. So if there are platforms, see if you can lower them, remove them, or create walkable-ramps. The idea is you do not want major leg movement which will strain the surgical site. Even if he feels OK to jump, he doesn’t understand the repercussions of it on his healing. In terms of your water bowl, anywhere that makes it easier for him to access and use.
After Wick’s neuter, he was sleepy the rest of the evening (6 hours) due to medication, so the sleeping you are observing, in my opinion is normal. Wick spent about 2-3 hours leaning against my arm and going in and out of sleep. It is great to keep fresh hay available, veggies, and pellets so that when he is comfortable with nibbling, he can do that. I know with Wick, I made a point to cycle through new hay so he always had the most enticing piles to peak his interest.
With neuters, the recovery time is shorter. Vets recommend a week of limited space, but that’s a good safe-guard as a “just in case”. Honestly, Wick was back to normal in 2-3 days. If you find, after the initial drowsiness passes, that he is showing signs of pain or discomfort, don’t hesitate to post and/or call your vet for some consultation!
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.