Most importantly, a chat with your doctor is most certainly advised. The symptoms in your back and leg are very much like those of your sciatic nerve being under pressure / pinched (Sciatica). As far as your hands go, these symptoms can be present in Carpal Tunnel Syndrome and if things get worse, can be sorted either with injections or a minor operation, both of which I have had done on my left hand/wrist and will most probably have on my right very soon. But, I am not a doctor and these symptoms may present themselves in many other conditions. So, please get a proper check up and seek advice from your doctor. Best wishes.