How to cope at a wedding with an eating?

My boyfriend's sisters wedding is in one month now and I am so anxious about it. As far as I know there isn't going to be a meal just a big party which I really hate.

I have really bad anxiety so I am probably going to drink which is not good either. Or I am going yo drink and not eat as I don't eat in public meaning I am probably going to get loads of food and hide somewhere and eat it all then make myself sick.

Obviously all are not great. I'm dreading it. I am forced to go. I can't afford therapy and even if I could my anxiety is too bad to speak to people. Any ideas on what to do please?
How to cope at a wedding with an eating?
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