@Surasanji sounds like a sinus headache, treat your sinuses and not the headache.
@Surasanji stuffiness does not need to accompany a sinus infection.
@Surasanji A headache is often the only sign of a sinus headache most people will have. Is the headache focused towards the front?
@freemo I don't feel sick, either. Like, it's just this headache. Woke up with it and it's just gotten worse.
Family history of migraines, too. Though, I've been lucky to not have serious ones.