I had to bear down (vagal?), to lower my blood pressure how long will this last five minutes, two hours? I am a bit nervous I am 39 year old white male no medical history. This morning I awoke and started experiencing chest pain, (severe); took one aspirin went out into the cold air; pain subsided. Blood pressure has been high all day until I did this. Morning BP 147/ 96; BP at 2145, 147/102 after bearing down five minutes later, BP 121/ 87. Thank you kindly for your help. Good day.