Advice?

So as of late I'm beginning to notice that my social anxiety is...creeping up on me again.

 It's been improving I thought: Last year I had no problems with it really but now whenever I talk or say something I always worry if what I said sounded offensive, rude, impolite, stupid etc etc. With family members its no problem of course or with close friends/aquaintences: But if I'm trying to interract with a new person it's rather nerve wracking for me. Not to the point I can't speak but more so when I stutter constantly and get very nervous around the person.

My head begins to hurt and I sometimes feel dizzy even trying to get things sorted out. Especially in crowded places.

I know this is a roleplaying site and all but out of curiosity if some of you have this how do you handle your nerves or nerve wracking situations?

Please and thank you.