Anyone in gs have any experience dealing with stalkers?

Well I am uming he did more than just go to your job, because I wouldn't consider one incident stalking. That said, metro pcs shouldn't have a directory of phone numbers available to the public. I'm not sure about where you live, but in Florida they are pre-paid only. As for your house, that is public record, but this man would have to put some work into it to figure out where you live. You are doing the right thing by taking gun cles. You should also take some cles in self-defense. If you have time, take street fighting cles as well and get a concealed weapon permit to carry your gun everywhere you go. Good luck. Hope everything works out well and stay safe!