Funny Feelings

What's it called when you have this funny feeling in your stomach?
Right below your ribs and above your belly button?
I've felt it many times before.
Not always for the same reason.
I've felt it when I first fell in love;
and every time since then that I fell in love or thought I did.
I felt it the first time I saw the woman who is now my wife;
I still feel it often when I see her.
I feel it when I see my son and my daughter;
although it took me a while to figure out that the fear I was feeling was more than just that.
I felt it when I first thought I understood Life, the Universe, and Everything;
when I first felt one with Everything;
when I first thought I understood what it was all about.
I feel it when I read a particularly insightful sentence in a book.
I feel it when I make a connection with someone.
It makes me feel like looking inwards.
It makes me feel like embracing whatever gives me that feeling.
It makes me feel... funny?
I still don't know what it's called.