Today was a really bad day.

I woke up early to meet with a professor because I had a math test in his class today. I met with him for 2 hours and explained my understanding of everything we'd studied and he said he was certain I would do well on his test and was glad that I was so well prepared. When I got the midterm, I had a mental breakdown and choked and couldn't answer a single question on it. I don't understand. I gave it back to him afterwards and told him what happened and he said he'd take a look at it. I don't understand.

Then I went to work in a small customer service job and got told to go to a meeting because apparently I had received a complaint from another staff member that I wasn't a good "team player" so I'm being put on "parole" which means they will watch me and if I don't improve they will fire me. Now I am still working and I just want to break down. I feel bad.. I try really hard but I just feel like I'm failing. I am studying as hard as I can and never party and everything but still can hardly keep my grades up at all.

I feel like breaking down right now and just not talking to anyone for a long time.
What do I do from here?