I know the feeling, but for some fandoms... for the creator, there is nothing ethically wrong with fanfics. Hell, there are people who make and sell doujinshi (in Japan) with the blessing of their creators - every doujin or fanfic brings recognition to the original.

What is it a fanfic of, if I may ask? Is it something you can skate around carefully? After all, there's no such thing as an 'original idea': most everything's been done before in some way.