question: My BP is pretty much normal on the top number but the bottom number has been low...around 55. It gets lower after I first wake up and take a reading...it does not change much by eating or drinking....pulse ranges around 68 on average. I had 2 stents placed about 2 years ago and also have 2 valves leaking..one moderately and one moderately severe. Should I be making appointment with heart doctor or are readings like 109/55, 98/54, 103/57 okay.