Thanks for the suggestions!
I have heard of the crating idea before but the problem is that he begins to desperately scratch the door and when I arrive home the floor is filled with blood and he has open wounds on his paws.
And I read that if I put him in a crate with him doing that kind of scratching, he could really hurt himself.
I have an appointment with the vet this week to see what he says, but its worrying me a lot.
Lets see what the vet says.