Be Still My Heart Meaning

What does it mean when someone says oh take care of my heart?

My English teachers always say that and I think it sounds good but I don't know what that means. Can anyone explain to me? And is it taken from poetry, cinema or medicine? Or is it a popular saying? Thanks

My understanding of this saying is that it belongs to the Victorian era! When this happened very well, Sharafat, the woman, said angrily: Oh, my heart is still beating! Give them time to think about the answer !! I think Americans say today in the early fifties !! I prefer the spoken version, but am I just an Odyssey? I always loved the original !! Can you explain this to your English teacher? Get well, oh, enjoy your life!

Surprise my heart

Be Still My Heart Meaning

I understand what it means or how I use it.
If you have a feeling (hearing, seeing, feeling) that makes your heart beat faster, makes your heart beat faster, turns you on, or is too emotional, I say Huh: Oh, relax my heart.
I am sarcastic when someone tells a story. I said this and played the smallest violin