Hi, for the last few weeks I have been experiencing heart palpatations, tumbling feeling, headache comes with this. My last bp I just took was 90/52. I am on a high blood pressure medicing almopodine 5 mg and a baby aspirin. I also take lorazepam for sleep. It seems worse when I am laying down. I am a 57 year old female, exercise regularly, eat healthy, walk a lot, etc. What can this be caused from?