If you can't find a vet from the list / link that was posted for you, call your extension office. They will be able to put you in touch with someone who can help you.
I agree with BarkerChickens at this point. I too was thinking the new bird brought this with it. I brought home a chick last summer that was infected with Coryza. I had no clue of course, until I threw it in with some newly hatched ones and it had already been in a box with some older chicks...
**From the rules:
6. No Spam. Spamming is posting the same thing several times. "Bumping" (posting to move a thread up on the forum list) and cross-posting (posting the same thread in several forums) are examples of spam.
I had actually already seen your thread, as I'm sure others have, but do...