It sucks to not know.
To not know what happened, what is happening,and whats going to happen.
Whether its not knowing how he/she feels about you,
or not knowing if a loved one is going to make it.
It tears you apart.
It eats you alive. 
You cant do anything about it but wait and see what happens next. 
You dont know anything. And you might never know. It really sucks, because the fact of not knowing, hurts more than knowing.
Your mind jumps to the worst scenarios.
You cant help it. Cant stop it.
So you have no choice but to just sit back and
Wait.