stop worrying about it and accept it and then gradually desensitise yourself, wear a motorbike crash helmet
books on how to stop worrying have useful advice
dizzyness can be caused by fear and many othger things, have docs checked for other causes of the dizzyness?
there are ways of falling without hitting your head, are you more likely than average to fall,
if so see a physio about strengthening your ankles, there are exercises, a walking frame may help at bad times
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