What Causes Sleeplessness, Weakness In Muscles And Nausea?

I cant concentrate. i hate looking at a screen without music. My muscles are weak and soft. i cant sleep properly. im scared of people. i forget events. i ve blacked out before for a second. My chest hurts. i have no energy. i feel nauseous. my heart beats faster when i see someone i think is going to threaten me. i cry. i feel like ill fall down the stairs. i dont know, what i have but i want it to stop please.