agree with achillea^^^ 110%. I went to a cardiology appointment with my mom recently and he was talking about a guy who takes his BP 3 x per day. Doc was like..."don't do that". Also, I used to monitor my pulse too. no good came from it. I stopped.
Your heart rate is perfectly normal.
Are you receiving treatment for your heart anxiety? If not, it would be a good idea. No one gets any useful information from checking the pulse several times a day. It's a nervous habit, like picking at a scab.
58 isn't bad, im 2t and my resting hr dropped to 42 bpm while on a monitor and my doctor said not to worry. I was also om cardizem at the which lowers the hr. But day to day with no meds my hr can drop below 60 bpm.
58 is perfectly healthy and normal.