Hi, my age is 24 and I am suffering from weakness from last 3 months. I can not walk much ,result in leg pain if I sit on chair for more then couple of hours then it result in back pain. my hands are shivering a bit.when I wake up in the morning , there is back pain.this problems are from last 3 months I had left the job because of this. I had taken reports of thyroid,calcium,vit d,vit b12,HIV,diabetic,chest xray all are normal please advice some thing.