Eventually we pulled him out of litter box, because Stilts had to, well, use it. Felix curled up in the corner of the living room, at first against me. when I left the room he meowed sounding totally panicked, but refusing to move. It was really sad. Virginia curled up with him and he calmed down, but he wasn't himself until we got back to our apartment. Crazy kitty.
Have a great day, and keep crafting!