$500 on the table is ridiculous. I'd look for someone who is going to tell me how they would treat him (medically speaking).
I've been researching and found this article. Read it and perhaps it can help you. I'm really sorry this has happened to you.
I'm not really certain, but I don't think a humidifier is a good idea with pneumonia. Perhaps someone else knows more. Keep him warm, not hot.
Read this and perhaps you'll know more of what you're dealing with.
Keep us posted on what is happening? Perhaps we can help some way.
http://www.veterinarypartner.com/Con...=13&A=1758&S=0