The threshold of below 60 Beats Per Minute as being Bradycardia is of little concern to the several cardiologists I have seen over the years. Most are happy with a resting or sleeping pulse much lower than that, but would begin to assess if dizziness, say on rising, or feeling lightheaded, is being experienced. If you wore a Holter Monitor and recorded 24 hours of activity and did not catch an event, it apparently isn't, at least at that time, daily.
You mention SVT (I've experienced PSVT, scary, the Holters never caught it, I had to wear an event monitor. I was relieved when I phoned in the event and the tech, in a rather bored voice, said "oh, you had a little PSVT" and didn't tell me to go to the hospital). There is a disorder known as Inappropriate Sinus Tachycardia. See the following link for some questions and comments that appear to be relevant to your situation. www.medhelp.org/posts/Heart-Disease/Tachy-after-eating/show/250081