Got unconscious. I related to it!

Week back I meet with an accident on my bike, I rided bike for around 5 hours then after took half hour rest . Then stared riding again ,I drive for an hour then after I meet with accident. I was fasting and had only fruits before starting at 11:00 a.m, then during break had only chilled water. Around 6:30 I meet with an accident ,my problem is that I don't remember any of accident ,may be I got unconscious due to which I meet with an accident. When I was conscious I was in car , but I didn't remember anything ,how did I meet with accident how did I was taken into car .Had some injuries on leg , chest. From past few weeks I am also having pulling sensation on right side of brain. Want to know that Is my unconsciousness I related to it