Will Falconer, DVM Moderator
I'd not hold out hope for conventional veterinarians to have answers. See if Chas Loops DVM has room for you. Homeopathic vet specializing in cancer, which is the #1 rule out for multiple lymph nodes enlarged. Time is not on your side.
p.s. as you'll see in the comments, even at a regular dose, lymphoma is very common from this drug.