migraine.
nausea
vomitting
visual impairment or disturbance, black spots, flashing lights, temporary blindness
typically one sided (but not always)
possible diarhhea
exhaustion
stiffness typically of the neck/shoulders may extend to limbs or down the back
difficulty in speaking.
I was on a "danger list" with my doctor from about 13 years old because of the severity and frequency of my migraines, tried numerous drugs none helped.
(6 times a year is classed as frequent - I was getting them 6 times per month)
I outgrew them as suddenly as they started.
I rarely have them now - but I have had 2 in the past week.