Can you help me? How to switch off and not feel anything?

I’m in so much pain. I just found out my bestfriend slept with my ex boyfriend behind my back while we were dating. I couldn’t feel worse right now. Please help me, If’ll keep feeling like this I think I’ll go crazy. How do I turn all this pain off? Tomorrow I need to act like nothing’s happening and I feel like it’s gonna be the hardest thing ever. In school I sit right in front of my ex boyfriend and next to my best friend. They don’t know that I know this, because I just found out. Also we have tests tomorrow and I’m not able to do anything. Should I stay home? I can’t tell my parents about this so they won’t let me stay
Can you help me? How to switch off and not feel anything?
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