Pounding Heart

I have this for a long time. This unknown feeling since the time I started to talk to someone. What is this? Am I sick? Do I have an extreme fear of people called Anthropophobia or social phobia? 

.... but this is impossible!! I never had this feeling to anyone except Him.  It's only Him who can make my heart pound.

What is this? I am not familiar with this feeling. I don't know how to face this. I spend the nights and days analyzing. I  kept on thinking and I thought I was depressed, I can't hold it anymore. I was so scared how much I think about him. It's scary and at the same time it feels good. 

I want to express it. I want to show it. I want to release this feeling. I want Him to know.

But I'm scared thinking that it hurts not knowing if I'm sick or not. But, it feels good seeing and talking with Him. What is this?

Could anyone tell me? My heart is really pounding right now, I'm scared. I don't want to ask this to Him because I don't have the courage to face Him. I don't know why? Why its just Him?

When you're around, my whole body knows it

Ending.... “Among my stillness was a pounding heart.”