I lay in bed a few months back and screamed and screamed for quite some time, maybe 20 minutes. I was scared about growing older with no family nearby, no real friends and no one who really cared about me that much. Sure, friends stop by once or twice a month or so, the few I have. They see if mybe I need to go to the store, because I have no car. Maybe that chat for 20 minutes, but 99% of the time I am ALONE.
I live in an apartment building and I am sure that some neighbors had to have heard, but no one knocked on my door or anything.
A few days later I apologised to my next door neighbor, but she claimed she'd never heard a thing. I guess either she had the TV on loud or she was fibbing. Either way, I was relieved that she seemed not to have been bothered by it. I can hear into her apartment when she coughs (she is a smoker) and so I assume she could have heard, but.... who knows!