A week and a half ago I woke up with a sudden stabbing pain on the back of my head, as if I'd hit it on something hard without realising. It was very sore but painkillers numbed the worst of the pain, however last Tuesday I was sat in bed and suddenly felt very dizzy, the pain from that spot felt like it was spreading from the sore spot down the left side of my head and then to he front, light suddenly really hurt my eyes and I had to lie down and shut my eyes for an hour. Whilst I feel better now I have had a mild but persistent headache since, also the sore patch - which no longer hurts - had no heat or swelling. Any advice about what the cause of this pain and dizziness could be? Could it just be a head injury I didn't know I had?