Hello,
I would probably go find a different vet and ask for more help. It doesn’t sound like your vet is helping you enough. I also think that a full patient care conversation is warranted. I talked about how to help manage these guys wrt feeding peeing pooping ambulating and pain meds. I also talk about methocarbamol as I think these guys need this. Also ask about gabapentin and acupuncture.
I have a lot of information on my blog and YouTube channel. Kmdvm.blogspot.Com search Ivdd.
I’m sorry, but this is an emergency. He WILL die if he doesn’t get immediate medical attention. Please try to get funds – gofundme, Care Credit, borrow from friends and family.