If you want to stop that countless email because of your watched topic just look to your profile. click on 'watched topic' tabs and untick all topic there to remove it from your list. after that you will not recieve any email again.
In your profile, at prefferences, you have something like: Always notify me of answers to my messages (i don't know how it is in english, since i have it in romanian, but it should be something like that)...
i checked this profile because it is in english and it is called "Always notify me of replies". It sends an e-mail when someone replies to a topic you have posted in.