I'm sorry to hear you are having an amazing opportunity, but the anxiety is getting the best of you. I know that sucks. Is something particular causing it? Do you have medication that helps? Are you worried about full on panic attack?
W/o knowing exactly what's going on, except that you are with "friends " you Don 't trust and it IS work function which adds pressure.. well. ...How are you at putting focus on those around you? Have you ever read "How to win friends and influence people"? I'm sure there are cheap 2nd hand paperback s out there, its worth a read. I read it once, since our work manager handed out copies and assigned us to read out. I attended an important work celebration soon after w the companies clients. Feedback came back on ME! That I was just impressive, lovely, professional, etc. (I think I'll give it a read again and apply to my personal life!)

But since you can't read now, basically, it's about focusing on those around you (this should take pressure off of yourself) be sincere! Ask them about themselves. .. not in that aggressive news interviews way, but unobtrusive, quiet, thoughtful questions. Really listen to their answers, where you may pick up clues as to what interests them. Don 't corner anyone and close them in. Work the party. A few sincere but not too personal questions. ..even "so, u work in receiving?" "How did you get into that?" In their answer they may reveal they like sailing or cooking. .. things totally unrelated which take the conversion to a fun place. Leave an exit for you, and then, move on. .."Oh, I need to grab another water. .."
It's so much easier when you don't really have to talk too much about yourself, and people will remember better, when you don't. Cuz they got to talk about their favorite topic! Themselves! Lol

There doesn't seem to be a thing to cause it. I am scared that it's going to get worse. I don't have any medicine to help.

Sorry to hear that you are unable to enjoy yourself while on a work function at the beach. You mentioned that you are not on medication. Your panic attacks and anxiety will probably continue unless you seek professional help. You can start with a psychiatrist who will evaluate and diagnose you. They may recommend medication and talk therapy. Therapy could prove to be very helpful for you.

I understand completely ugh I hate anxiety. I'm sure you want to enjoy yourself but stupid anxiety has to mess it up for you. Iwas feeling anxious myself earlier but family for me is a big trigger cause I know they talk shit behind my back but that is them and not me.