Help! nosey, old neighbor drives me nuts?

i feel like a hostage in my own home & am having bad thoughts like i wish he'd go in his house and keel over. what a relief that would be for my family. if i go outside, he stares me down. if we work in yard, he points his chair this way to get a better view. needless to say, i don't work in my yard anymore because i am a private person. i wish he'd leave me alone. i've made it clear i don't like him. if i see him crossing hte street, i will run inside and make the kids get the door and say i'm busy. he checks his watch when we leave and come home. if we go on bikes, he shuffles out to the street to watch till we turn. he was getting my mail, and hollering for me to come ge it. then he got attitude cuz i wouldn't go get it, i sent my son and he got ugly with my kid asking him "why didn't you mom come, is she scared of me? aren't you going to say thank you?" i told the postmaster about it, hopefully that will stop. he drinks beer all day. yesterday, i flipped him off.