What Causes Sudden And Severe Headache Just Above The Eyebrow?

I had sudden severe headache unilateral . it was horrible pain just above lt. eye brow . it was throbbing like axe cutting my brain. b.p. was180--110 but after hypotensive &n.s.a.d. all symptoms dramatically improved
imr showed central cortical brain involutional changes &bilateral deep white matter periventricular fociof lacunar infarction are seen
pl. advice me if I must be worry although I ,m free now no symptoms