This happened to us, too, and we got some help from Four Paws Cat Rescue. There is a lady in the neighborhood who volunteers for them and she took him to the vet and they got him into their system and answered any questions we had. Now, we did agree to foster him (and he was featured here on PoP) and he got adopted a couple months later. There are very few foster homes available now so it’s not likely you’ll be able to get a rescue or no-kill shelter to just take him off your hands. But definitely call a local shelter or rescue to find out your options!