Headache after trauma. Just a headache?

Hi, i banged my head, just above my left eyebrow, on Monday morning. It was quite a bad bang and a big lump came up straight away. on Tuesday I started to get a headache around lunch time. By 5pm it was quite bad so I took a painkiller. that had no effect and by 7pm it was very severe and I was so unusually tired. I went to bed but by 9pm it was agony, I couldn't even open my eyes my head was so sore. ive never had a headache like it and I've never suffered from migraines. that pain lasted right through until Wednesday. It started to ease a bit around lunch time Wednesday, I could get up at this stage but was very lethargic. It was gone going to bed. today (thursdsy) I woke with a mild headache and slight pain in my left eye which hurts when I move my eyeball at a normal pace. I'm worried now this is a result of the bang on monday. Could this be something more serious than just a headache?