Can Too Much Adrenaline, Anxiety And Pounding Heart Damage The Heart?

okay, thanks ! I am 49 and I since I was 36 my heart is pounding hard at times and recently all the time. At 36 I went thru standard tests but nothing irregular showed up. I have in the past used too much adrenaline in my over all life and I have a certain amount of anxiety which I know has my body on the alert way too much. I have a hard time relaxing. I am 6ft, 150lbs and both a non drinker and non smoker who farms for a living and is way more active than the normal person and there are no heart problems at all in my family. My main question is...........is it possible to do damage to my heart from too much adrenaline? I know I have been hard on my heart over the years from stress. I haven't been to a Dr. in 12 years.