I cant interact with anything now, i was in the "i need you to do something for me" mod of having a follower, then when i changed into werewolf form, it wont go away.i have tried fast travelling, talking to that follower again, telling them to leave. now they are gone and i cant get them back, because i cant open doors, all i do is tell a follower i dont have to do things. Plus i cant kill the folower because she is essential, regardless i cant get to her anymore. Anyone have any clue at all how to fix this? i restarted my ps3, loaded an older save, killed myself, got a bounty hunter to talk to me, still wont go away. The folower is serena, could uninstalling and reinstalling dawngaurd work? or would that corrupt my save?

It shouldn't corrupt your save, but try the uninstall/reinstall. Make sure you also install all the DLC you have as well.