My father had two cardiac stents placed about 1 1/2 weeks ago, earlier this am he was having chest pain and took a nitro which he says helped. He just had an episode where he said he felt dizzy cold and sweaty, his bp was 147/74 pulse 72 taken on the left wrist with auto bp. He said he took another nitro went to the bathroom had a bowel movement washed his face and says hes feeling better. Rechecked his bp and its now 113/67 pulse 71. Are these common symptoms post cardiac stents, what is he experiencing, and does he need to seek ER care?