MaryL:

Are you within driving distance of a veterinary college? That is
often a good option.

Calling them today.

Incidentally, I am very concerned that your vet would have given a
rabies shot (or any vaccination) at a time when your cat is obviously
ill.

Yeah, after I read the complications that could (and did) result I pretty
much lost all confidence in that vet. The Rabies vaccine was like pouring
salt in a wound.