So, i don't want to be a werewolf anymore, and i'm looking for a cure.
I already cured Kodlak, Farkas and Vilkas, and at that time when i cured them, i also cured myself, following the Companions questline.

I then became Harbinger, and after playing for many hours (i was already cured) i turned into a vampire, by accident.

I didn't know how to cure myself, so i went to Aela and asked for her to turn me into a werewolf again, and that cured my vampirism, but now i can't cure the lycanthropy.

I went to the "Flame of the Harbinger" and i have a witch head, but nothing happens when i click it.

Anyone has a hint about this?

I believe i killed my wolf spirit in the first time that i cured myself in the temple, but now i just can't do it again!

Thanks in advance and i hope someone knows the answer for this, since everywhere i look, people talk about the purity quests and blablabla, but yes, i already complete them.

The last quest i did a few minutes ago was to help Aela to get 3 artifacts and now all i get are some random quests to kill animals etc.

Why would you even turn back into a werewolf if you didn't want to be one you could have just cured the vampirism normally

Unless you want the Resting Bonus, there is no reason not to remain a werewolf. You don't have to give in to the blood of the beast unless you want to. But if your RPing a healed non-werewolf character I don't believe you can cure now.

In hindsight you can cure vampirism through a quest in Falkreath and don't need to be turned into a werewolf to cure it.

I had this bug it was before DG was released I had the head of the hagraven in the correct tomb with the fire. I click on the fire but nothing happend I was doing this the first time round. I couldn't cure myself of the curse, so I had to use a console command to do it.