I know this won't help you, but...
I go everywhere alone. Pretty much. I never have a date, even for date events. But though it makes me a bit anxious, it's also a great opportunity for people-watching, for talking to just about everyone ('cause you don't have to babysit your date, you can mingle as you like), spending some recharge time alone, etc. You're beholden to no one.
I know you're fraught; I guess I'm just suggesting that it's a chance to look at it a little bit differently. I'm older (44) and a woman, so you better believe people are judging me and feeling sorry for me at these events. The thing is, they don't really know me, they don't know how happy I can be alone, with the right attitude. I feel sorry for them, because they're so very dependent on meaningless social conventions, or so it appears to me.