I am the one you met

I am the one whose name you will not remember.

I am the one whose face you will not recall.

You met me on the worse day of your existence.

I am the one who beat your heart for you when you could not.

I am the one who caused you pain so you could live to feel joy.

You met me because something went wrong.

I am the one who comforted your family when you couldn't.

I am the one who cried for you when no one was looking.

You met me unwillingly.

I am the one you will never thank.

I am the one who doesn't expect it.

You met me the day you didn't die.

I am the one who doesn't want to know your name.

I am the one who will never forget your face.

You met me when you least expected it.

I am the one you will not recognize when we pass in the street.

I am the one you never wanted to meet.

You met me when you were dead.

I am the one who knew what to do.

I am the one who did CPR on you.

We met at just the right time.

Who am I?

An ER nurse