I am 16 years old girl, I Had chicken pox in the month of April 2016 from then I had pain in my legs and hands. I am having difficulty in going upstairs my legs pain so much that it's difficult to go to 2nd floor also ,I am having difficulty in cycling. And while writing, to my hands it starts paining in the wrist and to the fingers. And feeling very weak all the time also feeling lazy. My weight is 56 kg. Height of 162.5 cm. If I do any physical work my whole body pains .Please help me to know what exactly it is.