Meeting my favorite band, really nervous + anxiety, how to cope?

So I am going to finally meet my favorite band 30 Seconds to Mars in a month, I have VIP passes to their concert so I get to meet the band. But I am so nervous every time I think about it I feel very anxious and nauseous, and I don’t think that I can go through with it. I feel so overwhelmed to the point that I think I seriously need to see a psychiatrist. I don’t mind the nervousness but I am terrified that I am going to just cry in front of them like an Idiot. Any ideas on how to get through this?
(I know that their human, but I have so much respect for their work and music, and I just don’t want to come off as crazy even though i kinda am)