My four year old son lacks energy and complains his knees hurt everyday. he can not walk any distance and we've bought a special needs buggy as funding is taking so long. he has had bloods done which came back normal bar vitamin d levels which were at 31 so insufficient. he has been referred to a paediatrician as the health visitor said she thinks his knees are enlarged and slight bowing, yet doctor says his legs look fine....so we've been referred to physiotherapy and the paediatrician but he is in so much pain and the referral is taking so long what could be wrong it is taking over our lifes