Yes I know, it is tough to watch our cats feeling bad. I already wanted to suggest to go to the vet with Ivan. Unusual behavior could be the reason for an illness, too but it is good that Ivan is feeling better and better again. He is such a handsome boy !
Ivan is getting better by the day. Robocat's loss was bad enough, but seeing it effect Ivan was almost too much to bear. He's now starting to show affection to the kittens again instead of hitting them.