How do you say "breakdown" in french?

I'm home now. With runny red eyes and shaking knees.
I was supposed to hold a presentation in french, and I couldn't find a word, and I just repeated the same sentence like three times and then I started hyperventilating and then asked my partner to take over and took a step aside to commence freaking out. Someone asked if I wanted to step out for a second, first I said no, then I realized I didn't want the others to see me like that so I went outside, and a friend came after. She asked what it was and I started sobbing like a three year old.
I don't even know what was wrong. I guess it has just built up over the past few days. I'm done with treatment, sort of, and this seems to mean that the matter is to be ignored from now on. Forcing myself not to cope in self destructive ways forces me to actually feel things, which I'm not used to, and it tends to overpower me sometimes.
It's just so embarrassing that everyone had to see how real it is. I know I write about it all here, for anyone to read, and I'm not bothered by people knowing I have issues, but to actually see me come apart is something else. It's like seeing someones personality naked.