Trauma causing migraine?

Hi guys! Four days ago, I developed a migraine that comes and goes, mainly at night. The same day this occurred, in the morning, I slammed my head against the arm rest of my couch, hard enough for my head to come back up after hitting it. I have never had a brain injury or concussion before, though head aches are common, but usually only if I haven't eaten. The migraines have reached the point of nausea. I have tried ibuprofen, caffeine, and even Excedrine Migraine. None of this has helped. Should I worry about a concussion or is this a regular migraine?