I have this occur myself quite often. Usually a sign of inner ear infection and lymph nodes going crazy fighting it (and because it was a "local" fight i had no fever). I'm saddened that both GP's have made a scary situation worse by hearing hooves and looking for zebras instead of horses... I know how scary it is, and that you want it addressed ASAP, but I would think nothing traumatic like a biopsy should be done until simple things are investigated.

Hoping your dh doesn't have to wait too long at emergency. And don't be upset if they say no to investigating until antibiotics have been tried. I would assume that would be step one here to be honest...