Past live? or just something out of the blue?

I have always been scared of swimming pools, i wont go in them for some reason. not even when somebody's there. But yet i can go in the showers and swim in the sea. with no fear. One day i wanted to over come the fear of pools so i went to our hotel pool and had to Force my self to go in when i did i felt this shock that went though my body i hurryed up and go out of there and never went back again. that night i had a dream that had to be taken place in the 1940's i was with some friends in a pool we were jumping from side to side, i wouldn't jump on the deep end because i couldn't swim they kep making fun of me and pushed me in i hit my head on the side of the pool right then i woke up with a head ache? what the hell????