Sorry to hear that...you can get something like that from an air conditioner? That scares the bejesus out of me...I read something recently about how unhealthy AC can be and it's worried me ever since. The manufacturers should make it easier to clean the things inside and out. I also use a humidifier in the winter and the nozzle that shoots the water particles out is forever getting moldy. You really have to keep an eye on this stuff.
Did the hospital and/or surgeon not offer you some kind of discount given that you'll be paying for it yourself? 6 years ago I was diagnosed with skin cancer and was uninsured. The hospital (Bellevue in New York) were really helpful, offered to tailor a payment plan to my financial situation, and put me in contact with a charity that offers financial help to uninsured cancer patients. But what really blew me away was the surgeon, a Dr. Berman, who took pity on me and shaved thousands off his usual fee for the surgery. I guess I just got lucky. All in all it cost me over $10,000 that I couldn't really afford, but it was the best money I ever spent in my life considering what would have happened if it spread.
Good luck with the fundraising!