I am a female and at 14 i had weakness which started in my left foot it graduly progressed to a limp, i needed crutches then a wheelchair, i am now 17 and cannot stand or walk at all and use a wheelchair. I haven't walked for a year, i allways have really cold feet, i have foot drop and cannot move my ankles at all. I have no feeling in my elbows and numbness in my forearms. My back is becoming weaker. Any suggestions as to what it could be??