so i didn't know where to put this but to sum up my problem fast...

my xbox 360 wired controller use to work 100% perfectly,
but now i cant look up or down,(perfect for head shots if i'm on the same level as someone)
but its a tf2 problem not a controller problem,
because i can go into settings and assign actions to pushing my joystick up and down.

does anyone know how i can fix this?