I Have Vasodepressor Syncope N Something Else Where My Heart

I have vasodepressor syncope n something else where my heart goes too fast n blood pressure drops n blood pools in my legs n not enough oxygen to brain. Been on meds for 5 yrs(flurocorosine n serteline) n numerous others anyway today when I was walking in to pay for gas I felt weird n both legs shook n arms n feet...I waited in car n made it few blocks home n had when I sat. Lasted at 15_20minutes if not more. What was it?