Yeah, I get the wanting to scream and stuff but autism.
Sigh..
I had some trouble in math too, recently, and I basically used my pencil aggressively on my paper and poked holes in it when I got stuff wrong and probably sounded like an idiot.
Maybe just wait it out cuz it can't be much longer? Idk.. But also yeah it doesn't help that you're also hungry. Maybe talk to the teacher after?
So real. When I've been getting a few questions wrong, I feel like crem. Then a few minutes I feel better and have the courage to say something/raise my hand, and then make a fool of myself again.
It could also be that you're hungry and possibly didn't sleep well. I didn't do too well when I hadn't slept that well. I think it was the day I got 5 hours of sleep, not sure.
Sorry I also don't have a ton of advice, but also you can do it, I mean. You can make it through the class, then go get lunch maybe. Maybe ask someone you know if they brought, like, a granola bar or something.