why did I become a Dullahan

It the 2010 Year, it december 25 and is really cold recently, but If you would ask me, I would say that today is april fool's, because today, the day my world would change forever, ops.. not just my world, indeed the whole world is in a crisis right now, but that can be said later, my problems right now, are more important, because it's so hard to get our heads off the ground, and by that I really mean to say that I was beheaded, and now apart from the bizarre creature that left after behead me, my now "dead" body is moving at will, It strange, It like control your body normally, but because my head is not attached to my body, is like have a third cam vision on a game, but the controls are absolute trash, and you don't have a full sense of direction to move you body, but again, this is not the time to be cursing, after ALL, this is a blessing in desguise, I don't know why, but since the moment I was about to be beheaded, I can see a panel above, like a status windows, from a RPG that my brothers usually play, and while I still trying control my body, I looked over the status windows, and familiarized with It, First thing that make things clear to me, was the reason to why I still alive, apparently I not human anymore, I now a Undead, but not whatever Undead, I a legendary Dullahan, I don't know much about this Race, but If my history class serve me something, I know about a Black knight, know like a legend about been beheaded, end them coming back to life as Knight without head, in search of Revenge for his killers, and Now looks that I am the legend Itself, but why is so damn hard to fuckin move a Full capable body, well... I like to say that I a Genius capable of full control over one body, but It a Damn lie, It took over 5 hours, to finally be able to take back my head and put It back together, curiously my head don't fall back on the ground, but now is like she is a destachable part of my body, and now certanly strange to keep my head on my neck, but lets talks about the real deal now, the world just turned a around, a full 180%, now there monsters outside, people fighting them like Damn fucking knights and mages, and, I am a Dullahan now, so I am screwed.