I followed these tips, but it didn't help.
http://www.gamefront.com/skyrim-how-to-cure-being-a-werewolf/
I did a mission about curing for "Aela the Huntress", but all I got was a "Totem of the hunt" witch I can pray to in The Underforge without any results.
I have also read that I can burn a witch head in Ysgramor's Tomb, but I don't have any heads anymore (I killed all the witches and lost their heads some how, don't ask me how!). But the entrence to that place in the tomb is now sealed. (I found that out watching this video: http://www.youtube.com/watch?v=67dll2AMwhs )
Is there anything I can do to fix this or am I screwed?

PS! I finished the Companions quests weeks ago, but I hope it's not too late!