It's true that stress can bring on a migraine headache but, it's more typical of a tension headache. For a migraine, the more specific factors include bright lights, noise and alcohol. According to a souce I found on the net, "Tension headaches are usually described as a continuous pressure pain or tightness of varying severity over the entire head, whereas migraine headaches are a severe, throbbing pain over one or both temples, or behind one eye or ear, and are often accompanied by nausea and vomiting." The description above describes exactly what I've experienced with migraines.

migrain

Migraines: Myth Vs. Reality

another great site is WebMD.comA>

Migraines WebMD