So close to breaking down someone help me?

I can feel a panic attack coming on in my chest. I'm trying to stay focused on my exams but then I keep thinking negative. That if this university has rejected from entering their course then what's the point of me even trying to do 6 exams next week when I've barely gotten a C in the other ones.
Im not stupid, but sometimes I'll berate myself in my mind. Internalise it to the point where I think my teachers are being fake when they compliment my work. Im trying to do 3 subjects at the same time, its just too much to handle, theres so many words and things I have to remember and I swear Im trying but I cant and on top of that I'm taking anti-depressants for my migraines and my migraines only as well as Naproxen. I dont know what to do I want to go to sleep. Just sleep. I'm so tired but I dont want to let my family down, I want to inspire them not let them think that because I didnt get far that they wont and I know theyre thinking like that because of how they see me struggle. Im trying to juggle too many things at the same time and I feel like im being caged in and I cant take a break because I've been doing that and thats why Im in this position. And there is noone to help me, I dont want to bother my friends, they can deal with it and I cant. I'll br bringing them down. I dont want to do that. Someone just help me the hell out !