I do experience physical feeling when I’m near one I love. Something shivery in my chest. I see the person differently, the hair, the eyes. I also seem to think faster and clearer when I’m near that person, though I don’t know of many people who experience that (most will just get dizzy or dizzier near someone they love).
Also, I catch myself planning my live with that person, and handle these thoughts increadibly well.
I don’t know how to describe, most of falling in love for me is about parallel feelings, knowingness, feelings inside me, I don’t know how to describe them. Also, I do not necessarily fall in love and feel physically attracted to one same person, but it did happen once (remember I’m 16 and hadn’t been in love many times).