Ok hopefully im in the right place for this question. well here it goes.

I got the vampire disease, i did all the quest to help Count Hassildor cure his wife.
i revived the reward from him.
so im on my way back to go see Melisande to get the other dose that she was talking about....and she can do is talk about getting the ingedents for another cure.
well thats fine and all if i have to go back and find all the mats again for the cure, but i dont have the dagger anymore...and nor does she give me one..
Did i mess up somewhere?? i did everything that this quest chain told me to do and now i cant talk to her about that other dose she was suppose to have for me.
is there another way to cure vanpireism??? rather than doing this chain again??? or im in a glitched part of the game that i cant get out of.

I play on the xbox 360 and i have both copies of Oblivion. GOTY and Normal. but im currently playing on the GOTY version. patched and all.

If anyone can help me it would much appreciated.

and again im sorry if this thread is in the wrong place.