Along with owning animals, comes vet care. You need to be prepared for it.
I am betting 80% that Little Foot is in pain. He needs to be on pain meds. Rabbits do not sit like that unless there is something very obviously wrong. If you can't help him with taking him to a rabbit savvy vet, then I highly suggest turning him over to a rabbit rescue that will help him or having him humanely euthanized. You have to think of HIM right now. Eating very little is a sign of pain.