Weight loss?

Patient: I keep having different colours flash in front of my eyes all the time and it’s rather distracting also if I sit up from laying down to long, especially in the mornings my head gets very sore not from a headache but it feels as if I’m being hit in the head and it tends to hurt quite a lot causing me to close my eyes for several minutes before the pain goes away, but then I also have colours flash in my eyes, sometimes when the colours flash its from looking at a light bulb which is turned on or from a flash off a a camera. My dad said the reason for my head may be that I don’t eat enough, I admit I don’t eat loads but then I do loads of physical activities eg. running, normal p.e lessons.

Symptoms: Sore head, flashing colours,