Hopefully you feel better soon and hope he eats for you. I thought I'd input that Corny looks to be of a pudgy weight from this picture, isn't underweight at all. Even if he does have an issue that can be resolved after a fresh fecal is done and loses more weight in the mean time, I think he has awhile to spare! It will be awhile to still and offer food every few days before trying assist feeding or anything drastic.