I suffer was pretty bad anxiety and whenever I exercise to a certain level of exertion I start to feel dizzy faint and nauseous like I’m going to faint. I never have actually fainted. 

I’ve vomited many times but never lost consciousness. Sometimes I have to lie down with my feet in the air and I usually feel fine after a few minutes. The question I guess is: does my anxiety cause this? According to the cardiologist my heart is fine and I have no other conditions but whenever I exert and start to sweat sometimes my blood pressure drops and I feel sick. Anyone else experience anything similar?