He's still more calm than before his neuter and it's been 2 weeks since then... so I think there's hope! BUT, it's as if he's no longer potty trained now. He was 95% potty trained, and now he goes all over the house whenever he feels like it!!
I think I read somewhere on here that the relapse in potty training (or lack thereof) is common after a neuter. I certainly hope this phase passes soon.