Hi. I have been very stressed, can't sleep, and exhausted for about 4 months, was very stressed one night and started getting a loud, fast beating on the left side of my head, about 190 beats per second. This went on all night and left the next day. The diastolic blood pressure reading ranges around 95 when that happens. This goes on every night and is so loud and fast that I very rarely get more than maybe 3 hours sleep a night. This has been going on for over a month and it started last night at 8PM and is still going today at 5PM. I had a cat scan and an ultrasound on the carotid arteries in my neck and they are okay. Any suggestions?