my father is on pacemaker since 2003.last yr he experienced a stroke .he developed slurred speech,of which 90% was rectified.last month he suffered another stroke,with blackout,developed severe headache , & vomiting ..he was diagonised a clot in the occipetal lobe & was on ecospirin.his blood pressure is fluctuating between 40 to 90 & 100 & 140.Yesterday he suffered a blackout with a jerking sensation ...is it a stroke again?