Ok well if she does sound "wheezy," then she does "need," the Antibiotics! And if it's less then a 30 day supply?? It's not enough! And if they said give on an empty stomach?? Forget that! In my case "now," that was fine for about four day's?? And then my tummy started to bother me?? So I eat "something," now before I take them. Just a treat of some kind should be enough.
And the cough, if the vet, won't give you something?? Well I call BS, but that aside ... I would find a "Children's," cough syrup and give her that for a few day's. Day time formula.
I seriously doubt your gonna find a "deaf dog vet??" And "that," should make no difference anyway?? You need a Vet, that is not afraid of "real dog's," or you know large-ish dog's.
Boxer experienced would be preferable but my be hard to find?? But plan B, ask if they work with GSD's!! Lot's more of them around there are Boxer's. And (from what I have heard) "some," GSD's can be real "A-Hole's," at the Vet! Muzzles and drug's before a "vet," visit is not uncommon for those guys?? My "Rocky," had no "issues," with vet's, even thought ... he did not like people?? But yeah it was before "Covid," so I was in the room with him. But he was muzzled at first at my wife's insistence. But as I was there and after a visit or two ... I saw there was need for a muzzle, we ditched it.
But if a vet is afraid of a dog?? That dog is not gonna get the best of care, I would imagine?? So you might want to consider a muzzle if she is that bad?? Or yeah you know a vet that's not a "Candy A$$."