schnoedel

Hello, I think I need some help... I've got the quest Changing of the guards. After taking the quest I chose not to kill the guard. But I could not talk to the guard neither to Gedmar Doemenel to cancel the quest. Neither the guards nor the dozens wanted to give me their quests anymore because I was working together with the Doemenels. So I killed all the Doemenels to lower my reputation and to cancel the quest... But now I can't finish any of the storylines because they say "Oh no you're working for the Doemenels". Is there any possibility to correct my fault? Thank you for your help. Greetings, schnoedel