How to cure the disease

Well, I cured my own lycanthropy. I noticed there is one vote on this so I am sure that there are people who are still interested in this. I will leave as much detail as possible in the hope of helping people who have this issue in the future.

First of all, yes, the process for curing is exactly the same as how you cure Kodlak. You just have a witch's head in your inventory and examine that blue flame where you fought Kodlak's beast, and the option pops up, something like "Toss a head in the fire and cure your lycanthropy forever?"

Now, this is about the 300th time I'd tried activating that thing, so there is just some serious bug going on here. I think it's probably related to the fact that I spammed that flame the first time I was there during Kodlak's quest.

Here is the circumstance under which it finally worked:

To get the "purity" quest, continue doing random "quests" for Farkas and his brother until they tell you that they want to cure themselves.

I did Farkas and even though I used the flame to cure Farkas, I never got an option to cure myself. Then I did the same thing with his brother. When you have this quest, activating the blue flame causes the beast to come out right away.

After this, I tried to activate it, but nothing happened. Then I spoke to Vilkas and he said something like "Thanks, now I'm going to stay here for a while." After that, I tried the flame again and it worked.

I don't know if it finally working was related to what my actions were or whether it was just some random chance, but know that there is hope for those who think they will be stuck as a werewolf forever. Good luck.

There was a great walkthrough on how to cure Vampirism on Gamefront: due to that site's redesign, it's been lost, but here's the list, distilled:

• If it's within three days of becoming a vampire, you can cure the disease with a Cure Disease Potion.
• Activate any Shrine. The Shrine of Talos outside Whiterun will do. Shrines will cure you of all diseases.

Since it sounds like you're a Stage 4 vampire, you should feed so that you're no longer stage 4. To do this:

wait until night and drink the blood of a sleeping person. Even sleeping beggars will do. Just crouch/sneak and interact with a sleeping NPC to drink their blood.

NB: If you’re still having trouble drinking blood, remember that you have two useful abilities as a Stage 4 vampires — Embrace of Shadows, and Vampire Seduction. Embrace of Shadows turns you invisible, while Vampire Seduction will make an NPC calm and cease wanting to attack you.

Once you have contracted vampirism (e.g., gone beyond Day 4), you need to do the following:

• Speak with any Inn Keeper or Bartender about rumors. They’ll tell you that a man named Falion in Morthal is studying vampires.

• Find Morthal east of Fort Snowhawk. Once there, talk to Falion and he’ll discuss how to cure vampirism.

• He’ll tell you to get a Black Soul Gem. If you don’t have one, Falion will sell you one. Before being cured, you’ll need to fill the Black Soul Gem.

To fill a Black Soul Gem, you’ll need to cast a Soul Trap spell on a human, then kill them. Any human will work, including bandits and enemies.

• You’ll need to obtain a Soul Trap spell, sold by any magic vendor.

If you’re really desperate, try the College of Winterhold, or explore Whiterun to find a shop. If you don’t have high magic skills, just purchase a Soul Trap scroll. NOTE: The Mage for the Jarl of Whiterun, the Jarl’s Court Mage, should have a Soul Trap spell.

With a filled Black Soul Gem, return to Falion and talk to him to complete the ritual.