This sounds like a disaster. Gypsum dust is not only very corrosive but also very microscopic. I strongly do not recommend breathing this for a long time. How about having your air ducts checked? This system should collect most of this gypsum air suspension through natural air flow. I myself invite such the duct cleaining Toronto service -
https://comfortclean.com/ These guys do a great job. I'm sure this option will help you too.