Losing another cat

I am so angry at myself for risking letting the cats out already. I thought they would be able to cope but it seems not. Ashar has decided that he doesn't want to come back inside at all. When we call his name he comes running and meowing his head off but then he stops short and runs off the other way. He keeps diving under parked cars (There is a car park for residents out the front) and when we try to slide in and get him he darts off under another car.

Pica is fine, he isn't bothered about going out, only to do his business. I don't know what to do as Ashar has been out there for 24hrs now and hasn't had any food.

I couldn't cope with losing him like we lost Jason