Mental health concerns. Fine at all.

I'm unable to understand what has been happening with me from past few months. I have a strong urge to be productive but then I cannot pull myself out of the bed. I cannot sleep till 4-5 AM and when I do I tend to wake up evey half and hour crying or sweating. My palms are sweaty most of the time and I feel my heart pounding. I always feel zoned out and start crying out of nowhere, I don't understand. I always feel like walking towards the dead end. I want to socialise but can't get myself out there to do so. I have always been a very very confident person, always owned the room but now I skip tests and classes because it would mean going out among so many other people. I don't know what is it but I don't feel fine at all.