I'm so sorry to hear about your husband's diagnosis. My dog picked up blasto when we lived in Madisonville, KY. My vet said they see several cases during the year. It seems like Western, KY might be a hotspot, especially since it's considered to be in the Ohio river valley.
I don't know a whole lot about human cases but I would definitely keep searching for answers, especially if he is coughing up blood. This is a very serious disease - I didn't catch it in my dog in time. She showed symptoms for just a few weeks before she passed on and I had her treated as soon as we figured it might be blasto. I know the animals that have survived on here have taken meds for many, many months - some even well into a year.
Good luck with everything!