I am hoping it is an allergy. We'll try taking him off the new hay ASAP, there is still some of the old hay left, Star can eat the old while the other horses get the new. I don't think he is reacting to a toxin because there is nothing in his environment that 5 other horses are not exposed to as well, and none of the other horses are displaying any problems.
Vet#1 did not draw blood, he diagnosed staph infection and began treatment accordingly, but Star is not responding to treatment.
Vets2&3 both want blood work done.
From the discussion I had with vet#2 and the research I have done on line, I am concerned about possible renal or liver problems.