Why do I get dizzy when I cough? I am 58 withHBP, currently wearing a heart monitor for 2 more weeks (4 wks total). I have a history of passing out with no memory of what I doing before or just after. I have had brain scans, EKGs, Echos, I have vertigo use meclezine . I am 5 139 lbs. trying to lose weight. I take Synthroid and hits, amlodipine,topiramate, leapfrogging.