Pheba -
sorry to hear the problems are already so advanced round you.
I've enjoyed your posts a lot and at last have something I can post in return, that I think may be some help.
Many years ago we had a rather fine young Welsh Mountain stallion, who got a bit of a cough in the autumn.
We got the vet to him, paid for the drugs and his time, to no avail.
We got him back the next month, and paid some more. Cough got worse.
Got him back. Now really losing condition. Got him back, and so on.
Finally, in March, with the pony now in bronchitis verging towards pneumonia, the vet said,
"Well, I 'spect he'll get better with the spring."
We thanked him, paid him and went to see a professional herbalist.
What he recommended was 3 days of a mash including the dried root (steeped in water overnight)
of a plant called Elecampane (looks like a sort of small hippy sunflower).
This cost us about 1/60th of what we'd spent on the vet & his drugs over the winter.
I kid you not within a week not only was brochitis gone, but the cough too.
Since then I've also used it on dogs and people, to very good effect. Mind you its bitter so children need honey with it.
I don't know about suppliers in the US, so in case it's difficult here's a link to the oldest British firm who are very reliable.
www.baldwins.co.uk
Hoping this may be some help,
regards,
Backstop
"The best of conservation . . . is written not with a pen but with an axe."
(from "A Sand County Almanac" by Aldo Leopold, 1948.