I recently hit my nose, and then had a sex headache a day later. extremely painful, but soon subsided to a dull ache. can it be a ruptured aneurysm?

No, it is sexual HA: As the name implies, there are usually no positive medical findings. The sexual /orgasmic headache, may inconsistently occur as a very intense pain prior to or during orgasm. An aneurysm primarily asymptomatic, however, continuous headache may develop later, regardless of sex activity. See orofacial pain or headache specialist for diagnosis and management.