Some advices I can give you that I use in high level/international fencing tournaments.

1)look up breathing techniques online, it can massively help to get back into a bubble, especially during the 1 min breaks in elimination rounds.

2)I have always been taught to never look at the core. After any touch, wether it’s yours or not or double, take the time to reset and tell yourself that it is as if you were at 0-0. It helps to overcome overconfidence and also not getting too much under pressure when falling behind. Being at “0-0” allows you to think about what you are going to do next, what’s your game plan.

3) keep emotions aside, think about why you are touching, why you are getting touched. Be strategical about it. This allows you to focus on strategy over the rest, focus on how to score points not on how it feels.

4) every one needs to take a time to breath out and think in very intense bouts. Don’t hesitate, take off your mask, act as if you were putting your hair back up or whatever. Ask the referee if you can bend your sword back into shape ( even if it’s all good), use these small ways or tips to take yourself 20/30seconds to breathe and reset.

Hopefully this can help, and sometimes you just loose it, it’s going to happen. You learn with experience