What Causes Severe Headache Suddenly?

my 17yr old dtr has episodes where she gets a sudden severe headache. She goes to bed. gets up shortly after, feels nauseated, does not vomit, however. c/o weakness to extremities, also extremities feeling heavy, head feels heavy, can t focus, has hot flushing feeling, and occ. will pass out, sometimes she vomits afterward. This has been an issue for about 6 or 7 years. she s been tested -HGba1c- WNL. Had echocardiogram several years ago, ultrasound of heart, ekg. She had these sx just a few minutes ago and was crying, stated, something is wrong with me, mom, help me. i am a nurse but her sx are not typical of any one thing, they actually mimic many sx. i did check her pulse, it would skip a beat approx. every 10 beats She said sometimes esp. after her soccer games she feels sick and her heart flutters. Please help, as i don t think we can afford another Er/hospital visit to be told everything is normal. i did not realize that i have to pay to get an answer. I am unemployed and cannot afford to go out or pay herer. thanks you anyway.