There's a reason nothing is working. I don't know how to tell you this, but... Unfortunately, ataxia is a permanent condition that will slowly turn your character into a vegetable. You either have to reload a save from before you were infected or create a new character. .... Just kidding. You can cure it the following ways. Consume a potion of Cure Disease.Visit a Temple of the Divines and pray at the altar.Eat garlic bread.But as you said, you've done those things already. If your active effects menu is indeed clear of ataxia, but you still have people bothering you about looking ill... Well, that's a known bug.