Have you talked with a service officer from a local VFW? Most service officers are very well trained and will do the leg-work for the vet who is in need. They may not always be able to get the vet VA benefits, but many times will know who a vet can turn to for assistance.
If your husband needs hospital care, and he at least in "the system", VA hospitals must help him. A vet does not have to have a service connected disability to receive VA care. Your service officer can explain all available options. It is his/her job to help you through all the legal mumbo-jumbo.
Please, check with your local VFW's for the names of available service officers.
In the meantime, you may also want to check with your local hospice or home health. You really need help, and please don't give up. The VA system and Medicaid system can really be nightmares!
Hang in there, and keep in touch.