Are you going to post anyway, knowing the paranoia isn't real? Are you going to concentrate on the post and what you want instead of on what other people are doing/thinking? Are you going to remember the "more rational explanations get submerged" and dive/look for them?

Biggest thing I try to remember is that no one is going to change what they think of me as the result of just one post. Think about it; that's just 1/400ths of what they know you are. The more you post, the more people get to know you and get comfortable with you and you with them so there's less anxiety and paranoia.