As someone who worries about my heart I had a tendency to check my pulse anytime I don't feel 100%; as we all know that act alone can sometimes cause your pulse to rise and set off a downward spiral. To hide it from my wife and coworkers I would actually sit with my elbow on the desk/table and my head resting on my hand (with a thumb on the pulse in my neck) so it looked like I was just sitting with my head in my hand but I was actually taking my pulse - lol
Anyway, anytime I felt even remotely poorly or had some minor ache/pain I took my pulse and would get freaked out. I tried not taking my pulse and could go a couple of days but then would revert back. So I eventually came up with a different approach to try and end this stupid and pointless waste of time. In addition to taking my pulse when I felt poorly, I would also take it when I felt great and had no anxiety at all and no reason to want to check my pulse.
Walk up a flight of stairs with no chest pain or shortness of breath - take the pulse and see what its doing. Eat a big meal and feel fine? Take the pulse anyway - its beating faster. Stuff like that.
What I was hoping for, and what I really already knew and found to be true, is that even when you feel great, you'll find your heart beating faster/slower. Its not like your heart beats a perfect 72 BPM (my average) until something goes wrong then it changes like some early warning sign of danger - its always changing its BPM to adjust to whatever your body is doing and/or needs.
After about a month of checking it when I felt good, I began to get less concerned about taking it when I felt poorly because I had educated myself, with evidence I couldn't deny, to understand that its always changing whether I felt good or bad. For me this has made a HUGE difference and I now don't taking my pulse anywhere near as much as I used to only because I've come to realize that these little spikes/valleys that we feel when we don't feel 100% are just part of the normal rhythm of what is supposed to happen.
Lastly, when you do take your pulse, "throw away" the first couple of beats you feel. When I would first feel my pulse I would often freak because it would seem fast/slow whatever, but we need to keep in mind that its constantly beating and we're jumping in randomly so that 1st beat you feel could be the start of a new beat (which initially makes it seem fast) or just after a beat (which makes it seem slow because now your in the rest) and generally makes it feel like its not beating with regularity. I counted 5 beats that I would "throw away" no matte how fast/slow they felt then I would take my pulse for 15 seconds and use that figure.
Anyway, this helped me maybe it will help someone else.