What Causes Random Pain In Chest Cavity?

nausea for over a month, constant fatigue, debilitating headaches. MRI of the brain came up clean, CAT scan of my abdomen/pelvis showed an ovarian cyst, but that is long gone. opthamologists have checked my eyes, no signs of papillidema, i had a spinal tap 6/10 with an opening pressure of 22, slightly high and was thought to be the cause of my headaches, i was put on diamox. a few months later the headaches came back, got a second tap, OP was 17. still on 500 mg of diamox a day, i've had mono for the past 3 months, oh, and also, i get random pains in my chest cavity, please help, i'm 16, scared and out of answers