Boy, 4, falls over and hits his head 20 times a day due to mystery condition

As if mothers don't have enough to worry about: Boy, 4, falls over and hits his head 20 times a day due to mystery conditionDesperate mother left waiting six months for NHS specialist to see her son and diagnose condition Frankie needs to carried to bed and has to sit in a pushchair when going out for his own safety | UPDATED: 11:18 GMT, 11 May 2012 Being a mother is hard enough at the best of times.