Good news but still worried?

So I had an appointment with my cardiologist today and he said my heart is structurally great, I have a 0.1% burden and they my ectopic beats aren’t harmful at all. That I just have anxiety and need to treat it.

It’s wonderful news. But why do I still feel anxious? Why do these ectopic beats at times, scare the life out of me?

I’m a 32M btw and I’m just still so caught up in my head, that something is wrong. I hate it. I’m currently on propranolol and he wants me to start to taper off of it.