You may have the human form of mad cow disease.

IMPORTANT NOTICE

I'd just like to inform anyone who is suffering from a balance problem that they could be exhibiting symptoms of variant CJD (the human form of mad cow disease) if they have eaten a beef product in the UK in the last twenty years. It is therefore imperative that if you experiencing symptoms of balance disfunction, numbness?tingling/twitching/pins and needles in the arms of legs, visual disturbances, you get an MRI scan immediately in order to confirm that you are not a vCJD sufferer. If you are, you will die within two years due to progressive brain degeneration.