Looking for a reason

Why am I feeling so bad now? I have that constricted chest feeling you get when you've just heard bad news, when your breath is hard to find, and your arms and legs feel sapped of all willpower, and yet you feel like you could expend all your energy on just punching a bag to bits with all the force you can muster - so much more than what you thought you had. Just for that insensate oblivion you get when youre physically drained, so you cant think and cant see and cant feel, just to get away from it all. I have that feeling you get when you feel like breaking down and crying your heart out and scream full throated into the void of the night, against the injustice of the universe and your life in the midst of it all. When no music, no reading, no keeping your mind busy can stay the restlessness of your soul.
And yet I haven't heard any bad news, I haven't done anything that I shouldn't have, and I dont have a clue what's wrong.