It is indeed a strange thing to feel nothing. I can usually pick up on other's emotions if I focus which only makes my predicament stranger still.
I feel nothing, not happiness nor sorrow. It is a curious emptiness that lies in the infinity between emotions.
Whenever this happens to me I'm left wondering at the lack of emotion. It's so calming and peaceful. I'm fascinated by it, and yet I wonder how long it will last this time.