Wii U Pro Controller Randomly stopped working

I've had this Pro Controller for a year now, no problems until now. I was playing Smash with 2 of my friends and someone accidentally flipped over the game pad and than my controller suddenly stopped working but it still indicated that it was on in 2ed player. We've turned off the Wii U but the 2ed player light stayed on but still would not work. We've tried resyncing it, reseting the controller, putting it on the charger but nothing worked so far :l please help!