I wonder the same thing about myself. I can almost always feel my heart beating in my chest and I have palpitations ALL the time. It all started with a panic attack about three years ago and the only thing that helped I think was Zoloft. My doctor told me I had panic disorder and anxiety disorder. Now all I can think about is anxiety and I can't really engage in anything because it consumes my thoughts. I'm going to make a doctors appointment to further discuss my issues and maybe get back on Zoloft or some other kind of antidepressant because that helped my negative thought process.
How old are you by the way? I'm 26 and I'm sure I don't have a heart problem but I always think I do. It's a vicious cycle for me and hard for me to break out of.
I notice you posted this last month. Have things gotten better for you? Any news or updates? Hope all is well and you get the help you need.
I'm 18... it's down to 70 bpm now but I still fear it'll come back. It was hyperthyroid after all. As for palpitations, I recommend you take magnesium and potassium, they are absolutely necessary to remove palpitations. I heard of a person that had palpitations all the time like you and he increased intake of these two then it completely disappeared, like a miracle cure.