I felt this start between my shoulder blades behind the, 20 months ago, when I lay down at night. Very distinct. Not a palpation with a distinct beat but a sensation like touching your hand to something electric but the only place you feel the electricity is in that area. When it's really strong it radiates to the tips of the shoulders and the forehead. I've tried to explain it, worn a Halter, blood work is normal, been rejected for an Omega-3 trial due to too healthy levels. I am 65, female, a RN night charge nurse in a SD rural 25 bed hospital, married, many enjoyable responsibilities in community life, haven't smoked for 18 years, walk and/or ride bike regularly, had breast cancer 10 years ago. 5'6" 200" gained 40 pounds after stopping smoking, not able to lose it. Paternal grandparents died of MI in 80s, father of prostate CA, healthy heart. I do not suffer from anxiety. All I get from my MD is a pat on the head. Explain??? Thanks for your help.