The vet had an xray done, and it showed congestion. What I don't get is why
he didn't just diagnose asthma. With Cheeks, I took her in, he ruled out
heart worms, did an xray, it showed congestion, he said asthma. One shot of
Depo and she showed improvement in a week or so.

To the original poster: how long ago did she have her steroid shot? It takes
a bit of time to work. This "reverse sneezing": does your cat hunch over and
gasp for breath with her little tongue, just the tip, poking out? If so, it
is asthma. But you have to give the medicine time to work.

Another thing: I got rid of down comforters, vacuumed more, and switched to
a low-scent litter and my cat's symtoms disappeared to the point that she
gets a shot of Depo Medrol (steroid) twice a year and is fine. This "reverse
sneezing" (and what kind of stupid term is that?) is just plain asthmatic
wheezing. It is great that you have gotten treatment, and I expect that if
you give the medicine time to work you will see improvement, i.e. no
wheezing, no scary asthma attacks. If not, you should look into inhalers for
your cat.

I am not sure if you need a new vet or to just give the meds some time. It
might help if you do a simple web search on asthma and cats. Good luck.