I have bad social anxiety and I get married in front of 140 people in 5 months! Help!

I have bad social anxiety and it “flares” up from time to time. I saw a therapist for a while but they’re so expensive and all they want to do is prescribe me meds and I’d rather get coping mechanisms and talk about my issues! I get married in November this year in front of about 140 people and I am nervous as hell. Every few months going out in public or going to a family/friend party or something makes me extremely anxious. My anxiety shows physically through me feeling nauseous, throat closing up, my neck getting itchy, and me not being able to be present in a conversation, it’s just me wondering/worrying how I can leave. I really don’t want that to happen on my wedding day and I need some help and wondering if anyone else went through what I went through and maybe had any tips? Some days/weeks/months are better than others for my anxiety and it’s hard to pin point why or when it will be worse than other times. I hate my anxiety but I also can’t let it ruin my big day or my life. Ladies please help! I also want to try L-Thenein or whatever it’s called which is supposedly a natural anxiety calmer, if anyone’s tried that let me know as well!