i have ptsd too...i was in an explosion and badly burnt(smooth burns no scars)
I tell people i am bipolar....on the phone it has often worked for me. for instance i called the irs for help and was given an advocate and when i explained why my anxiety was going through the roof, the advocate said that he had a brother who had problems. I got kid glove treatment after that for the many times i had to deal with him. Other people also tell me in response that they have a family member or friend with problems and they too are understanding.
your neighbor sounds toxic....he would irritate me big time. I isolate myself a lot so i don't have to deal with obnoxious people. can you tell him next time that you really appreciate his being kind to you but you would prefer to be left alone..i guess that is confrontation that i hate also but it sounds like only the direct way would help you survive the situation. I have to confront somebody soon but he was just told he has cancer. He doesn't get the clues that i only want him as a friend if that.
Bobby