Breathing

Have been struggling with somatic breathing ocd. I start feeling like I can’t breathe and start feeling faint. I have a performance this weekend and my biggest fear is that I won’t be able to sing. I worry that I’m not gonna be able to perform cause it also causes a wave of fear and I’m scared I’m gonna feel too faint where I’m gonna have to go run off stage. I start hyperventilating and I don’t know how to stop it. My mind just makes me aware and then I eventually start hyperventilating. Any tips? I’ve tried just acknowledging it but it hasn’t helped the hyperventilating much. Any tips please? I have to go on stage for tech in 50 mins

Does anyone know how to get rid of these thoughts? I have to manually breathe almost every second of everyday and it's getting tiresome and I can't stop thinking about no matter what the distractions are.

PLEASEEE READ!! I know this sounds ridiculous but lately I’ve been soo hyperfocused on my breathing. I feel like I’m not breathing right/properly, it’s hard to explain.. it just feels wrong or like my breathing pattern is wrong. How that’s possible? I have no clue. I’ve had this all day. Has anyone ever experienced this?? My doctor keeps saying anxiety but I just feel like something isn’t right.