question: i am a 28 year old woman. for the last 6 months i have been lightheaded,constant headache, head pressure, fast heart rate. Ive had eyes checked and all was fine. Had bloodwork done and again all was fine. Was sent to cardiologist and many test and found nothing. was prescribed coreg to slow down my heart,but doesnt seem to  help. Im going to see a neurologist soon.Any ideas??