From what I understand of NDPH, it's often only the base of a head problem. For instance, I'm in constant moderate to upper-moderate pain, but frequently, I have headache flares that have the symptoms of true migraines. So, daily, for the most part, it's just pain and medication side effects, but often I do get the severe nausea, photophobia, phonophobia, stabbing pain, etc.
And 'just a headache', even if it doesn't go into migraine territory, isn't 'just a headache' when it's 24/7.
DX: NDPH, Bipolar 2, Recovered CRPS
RX: Zonegran, Lamictal, Minocyclin, Abilify, Cymbalta, Wellbutrin, Provigil, Clonazepam, Rozerem
PRN: DHE IM, Droperidol IM, Toradol IM, Haloperidol, Zyprexa, Thorazine, Zofran