You may be forced to call a cat rescue. We have one here that gets feral cats fixed, then returns them to the area they were found in, to live out their lives, after getting a nearby person to leave food out for the feral cats in the area. I will pray for you. It sounds like you may have a feral cat on your hands. If you do, you are 'holding it prisoner' (in it's own mind) and if it is feral, which it sounds like it may be, have the tips cut off before you release it. P.S. Feral cats have returned to the wild state and can not be pets. Talk to your local vet for help. I'm sorry this is so hard on you. (HUGS)