Just that really.
I got one of the worst headaches I've ever had last night, it was awful. I felt sick (to the point I was gagging over the toilet) and lying in bed in the dark didn't help. It's mostly gone this morning, little bits are hanging round but not that bad.
I get these maybe every 3-4 months, just out of the blue. How do I know if it's a migraine or just a headache?