Don't know if this idea is possible to implement at your place, but when one of my horses had heaves and I was at wit's end to try to save her, I portioned off a part of a dry lot w/shade and put her outside.  She had been in my "barn" that didn't even have solid walls,with wood shavings as bedding and pea gravel outside the stalls--totally clean and open-air-- but she must have been sensitive to something in there b/c when I put her outside, she got better very quickly.

Not that you don't have enough on your plate at the moment...

SuzanneM & Monty

Western Colorado — July 2014

Photo Album: https://groups.yahoo.com/neo/groups/echistory8/photos/albums/1794323561

CH: ECHistory8