I do not believe in ghosts. I do not think your experience proves afterlife either, but I am very glad that you are now ok! Scary! I am so blessed to have never been in a serious accident.
I do think many ghost hunting TV shows are really not out for the truth. Ghosts are wonderful sensational material and somehow disproving them would not equal top $$ for the show. But, to each his own. I cannot prove or disprove the existence of ghosts.