Not trying to be tacky or anything and I guess it's to be expected but he's not peeing a lot. Usually we are talking like Niagra Falls.
There's very little you could say about a horse that I would find tacky. He's probably a little dehydrated from not drinking much due to his illness.
How are you getting these pills down Okie? We always give shots so I don't know how fast pills start working. If they are on his feed he might not be getting all of it.