My experience sounds very similar to many of the other posts. I get what feels like adrenalin surges. It happens when I am on the edge of falling asleep and suddenly I get this feeling of adrenalin rush in my chest like when someone scares you. When I finally do get to sleep, I usually wake up every 2 hours when my heart feels like it does a "flip flop" The most I can usually sleep is about 4 hours without being disturbed by the heart beat. When the adrenalin surges happen during the day it makes me feel nervous or jittery. Sometimes they last for hours and then fade away for several hours. The problem is at night because I am not resting properly. I have tried to research this and I have thought about what could be causing it. I have had an EKG, a 24 hour Holter monitor, a Cardio Ultra Sound plus a Calcium Scan. (I was told the Calcium Scan does not show soft plaque). The doctor says everything looks O.K. but gave me a prescription for Toprol XL and Crestor. I have not purchased these medications and do not plan to do so. I am not ready or willing to deal with possible side effects of these drugs and would like to try diet and exercise to bring the Cholesterol in line first. Blood test shows some borderline high cholesterol, LDL 130, HDL 54, Triglycerides 72. B/P is 112 over 65. The calcium scan test rate was 2. I have never had any problem with sleep or anxiety. These symptoms started approximately 6 months ago after I had flu in March. At first it was occasionally, now it is every day and night. I have not had health problems before and I do not take any medications. I do take CoQ10, Fish Oil, and vitamins. I am 68 and I work in retail sales 3 days a week. In trying to research this problem I found this forum and hope to find some answers. I have considered that these symptoms could be caused by a virus, (or side effects of a flu virus) or chemicals in food, water, cosmetics, etc. It is interesting that so many others are having the same or similar problems. What do you recommend? Thank you for taking my question.