I noticed when I would get really tired or feel stressed that my heart would feel like it was double pumping, so I went to my doctor and he sent me to a cardiologist. The cardiologist put me on a halter monitor for like 5 days and then I went back for him to remove and read the findings. He then told me I should take time off until they found the issue because he suspected a bad valve. He did a heart catheterization and found that I was just having PVC's. He gave me a script for 25 mgs. of Atenolol to take as needed and cleared me to return to work. This all happened maybe 10 years ago. BTW, if you have these things, don't worry. I am told they are harmless, just annoying.
I don't want to mislead you guys and gals, but I retired from UA 2 years ago, but I like to keep up on what's happening. I have been reading the board for awhile and decided to make a few posts.