Question: I am a 39 year old female that other than female issues was very healthy until 7 years ago. At that point I began passing out. I never knew when it was coming, nothing leading up to it. Then 3 years ago I decided to make some healthy changes in my life (quit smoking, joined a gym) I found out very quickly that I couldn't just do what I wanted to. My heart all of a sudden begin to beat rapidly (154 bpm @ rest) I was dizzy almost constantly, fell often and wanted to sleep 18 hours a day. I went to a cardiologist (I have a family history of heart disease at an early age) He did the heart monitor test, stress test, tilt table test and ultra sound of the heart. Results: vasovagal syncope & mild septal weakness with a slight regurg and no explanation of the rapid heart rate however, the dr put me on metropolol and said whatever was going on I was young enough that I could handle it.... I accepted that until I begin having sever chest pains and ended up in the hospital. Enzymes were elevated but not terribly and after 36 hours they sent me home. The second occurrence of chest pain that landed me in the hospital I decided to go to a new cardiologist. He looked at the previously doctors test results and simply said you have POTS (postural nausea and complete and utter weakness. I fall often, seem to walk sideways when it is really bad and my right leg quivers as if it is jello (on sever days) I am so lost right now, my cariologist says some people have it worse... what do I do from here?

What type of testing is done to make a definitive diagnosis of posterior circulation ischemia?