Korsakoff's psychosis.
Why? You remember nothing, you will never form new memories ever again, and your brain creates memories that never happened, leaving you extremely confused and disorientated for the REST OF YOUR LIFE, existing in lucid intervals which you will not remember in the next lucid interval. Every moment of every day you will be in a place you do not remember, you will recognize people you've never met before from things that never happened, you won't be able to recall anything that happened more than ten minutes ago, and that's how you'll live your entire life from then on.