I'm a 16 year old girl and recently I've been having extreme pains throughout my whole body, so I went to the doctor and he diagnosed me with a thing called costochondritis. Turns out it's not that but they thought there was something wrong with my heart so I got an ECG and an x-ray done to rule out any problems. It all came back clear. I was so relieved but they never really gave me an actual diagnosis, it was more like "ah you might have this but you also might have this, or maybe this". So I'm left worrying and in pain not knowing what it is or how to treat it. It hurts all throughout my body and my mind can't help but wonder if it's something they haven't found and I'm dying. I'm terrified of sleeping, it's currently 3:21am and I'm in so much pain, in my chest, my arms, my back and my neck. I'm so utterly terrified of dying that I'm pushing off sleep for as long as possible, I don't want to die. I just can't get rid of this anxiety or convince myself that I will be ok.