"Unless you don't" Is the contracted form of "Unless you do not". You are trying to say that, "Unless you DO get you disorder under control i am not answering to your posts."
If you take your sentence apart, you basically said "Unless you do not, I am not" (This helps you see the double negative.)
Unless you want him to NOT get his disorder under control, then you do not need the "don't" in the sentence.
Having the "don't" in there means that unless he DOES NOT get his disorder under control, you are not answering to his posts.
This means that if he DOES get his disorder under control, you are not answering his posts. (Which is not, it think, what you meant.)
"Unless you get your disorder under control i am not answering to your posts." Is the correct way to write that sentence.
Another option would be it say 'If' instead of 'Unless' making the sentence read, "If you don't get your disorder under control i am not answering to your posts."
Either way is fine.
Hope that explains it! (:
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