It would be nice if his bladder is coming back to normal

That would be fantastic if his bladder is coming back to normal and that would be why he is peeing alot! Maybe that is what is happening. It is scary I know when you are not sure what could happen next!
I know when I get sick with a 24 hour virus it takes me much longer to get over that virus. My husband got sick last year with a 24 hour virus and it only lasted 24 hours. I caught it and stay sick for 4 days. And for me it’s very typical to see a Lupus flare right after that virus. And anything that has to do with my nervous system. I get scared!
I pray your son gets well very quickly and hope this never comes back. Wishing you my best! Hope everything turns out okay!
Linda H