Prayers for dear Spunky.

Maybe you could just call the vet's office and ask about an allergy medicine. I have read here on PT of cats taking Benadryl - much smaller dose, of course.

If you have a small bathroom, you could bring Spunky in with you and run the shower really hot. Steam can be helpful too.

Even try a vaporizer in the bathroom with a bit of Vick's in it. If you don't have one, they are inexpensive...maybe a friend or neighbour has one you could borrow.

{{{{hugs}}}}