Good news!! He actually doesn't have Hemolytic Anemia. The one vet said he did last night based on the results of his bloodwork, but today he called and said that it appears now that he just has a major infection somewhere in his body that's causing him to be anemic. I wasn't there so I don't know what made the vet change his mind (he's not our regular vet), but in any case, he should be able to be all fixed up and back to his regular self at some point!