[Toadies]

One of my boys is prone to URIs and I found that keeping him on a non-dusty bedding is the best, so no carefresh, wood shavings, etc. I would imagine that this type of bedding (towels, fleece) would help your little guy too. It's also alot easier to clean and cheaper in the long run. I also shake out their hay so that I get rid of as much of the dusty little bits as I can before I give it to them. A dirty cage, with its urine fumes, can irritate the poor babies too. Maybe just being in a cleaner environment will help.
I'd wait on the vet to give him any meds.
We, me and my boys, wish you much success and joy with York. He's a beauty.