Suggest Treatment For Sharp Pain On My Head

Hello, i keep getting this 'random' sharp pain on the right side of my head. it only comes every so many days. I thought nothing of it but this morning i was making a cup of tea and my eyes blacked out (black dots) and i seemed to have lost my senses during this. (sight and hearing)I also suffered nausea and dizziness. I sat down and when i went back, it happened again. After this i went to the loo and ended up fainting, not for long though. Do you have any advice?