Had a panic attack at my daughter's soccer game and now I'm embarrassed

Saturday morning, standing on the sidelines watching my 6yo play, and suddenly I'm sweating, my heart's racing, can't catch my breath. Had to walk away, sat in the car for 15 mins. Wife was watching the kids so she handled it but now I'm dreading the next game. What if it happens again? What if other parents saw? This is the third time this month and I don't even know what's triggering it anymore.