You're doing everything you can do for him and more than anyone else is doing. The antibiotics should keep his ear from getting infected, and you can continue to try to trap him for neuter. There's not much else you can do but keep trying. What you are already doing makes you a very special, caring person.I know it's ridiculous . . . but I just feel totally defeated. This particular feral is one of my favorites and I can't seem to help him, no matter how hard I try. It's beyond upsetting.