Have Problem In Vision After An Accident. Had Headache, Dizzy And Disoriented. What To Do?

Hi a few yrs back i had a bike accident where i was sitting at the back when we hit the ground i stood up and immediately I became very pale, clammy, and began to have tunnel vision as if I were going to black out. Then the black out turned into a white out. It was as if I could see TOO MUCH light, my friend wearing a white shirt became near invisible in the flood of brighteness. I was dizzy, disoriented, nauseous, cold and sweaty.The weirdest parts, as I said, was the fact that I could not see anything light colored - other than general shapes. Everything became super bright, but not painful to my eyes like looking at a bright light..... aft that i have just got really bad headache by my temples and when i open my mouth i feel the pan a little less or it i tie my head wit cloth my back outs have come on different occasions like a 7month gap o even more this is the 4th time it has occurred in like 8 yrs what could b wrong?