I am a survivor [!! -barely!]

of a brain aneurysm 16 years ago. My life has been nothing but pain since then. My personality changed for the worst. But my question is this: Can a brain aneurysm be brought on by a punch to the head?
About one year before my aneurysm my boyfriend and I were "play fighting" and it got rougher than intended. I took a good hard slap to the side of my head. I saw stars for hours afterwards. Then one year later: BOOM! Brain aneurysm. I know that a brain aneurysm begins with a congenital weakness, but I have always wondered if that slap to my head set off the event - that might otherwise have never happened, or might have happened years later.