I am female.66,,history of HBP and coronary artery disease,,,recently 2 1/2 weeks ago had a real bad dizzy spell while rolling up a blind, the dizziness has not gone away,,recently had MRI of brain and ekg,,both showed normal.Dr just treating me with meclizine, which is not helping,,most of the spinning happens when I lay down or get back up.it is getting frustrating. Any ideas?