I'm so sorry, that sounds like such a bad place to be in. I like PC because it's easier than real life. I do worry about those I meet here when I don't see them around on PC. Mostly I'm ok with thinking I've done something on here that would alienate someone or cause them to think I was a needy too sick person to chat with. But when I'm in a bad place I constantly think I've insulted someone or that I offended someone on here. Especially after I get opinionated, starting to be manic and think I know all the answers.
However I've found that this is one of the most understanding group of people because they've been in that spot and they do understand. I've been here 5 years now and most everybody has their up and downs, the monitors do a good job at keeping this a safe place and when someone gets too off the rails they get a warning. So please don't be so hard on yourself. I understand and I'm willing to bet most people here understand it too.