While I don't think I would confuse the sensation with anxiety, it kind of breeds anxiety. I always feel my heart beat, both from the chest, blood vessels and by small "muscle spasms" throughout my body, is there any substance, preferably legal, that can subdue this to some degree?

I'm not having high pressure or high resting pulse and it's so severe that, while not externally visible, causes for example a squeaky bed to squeak in rhythm with my heart beat.

I've had a prescription for Atomoxetin and it had some "body calming" effect but in some sense amplified the aforementioned effect.