How long does a head ache last after a broken nose?

I broke my nose on March 14th, and I have had a horrible head ache that only goes away if I push downward on the skin on my forehead and then it feels like it relaxes it, other wise the head ache starts in between my eyes and goes up to the top of my head in a straight line. It is not a pounding head ache, just an irritating one that doesn't seem to want to go way. The head ache did not start until March 14th after my dog head butted me in my nose.