The same thing was happening to me for several years. It would go up to 170 and not go down, until I lied down. If I get up, the same thing. It got worse and worse, till we went to the Mayo Clinic in Scottsdale, where I underwent an ablation. It took two, and the second was successful. What a blessing in my life. No body, who has not gone thru this, knows, how painful and frightening it is for you.