Dear friends, As there are so many musicians suffering with hand and back problems, I would herefore fully recommend to visit and contact http://www.paulmanley.co.uk/Musicians/treatment.html as he is highly experienced and helpful top hand specialist. Good luck!!
For back problems, I have found that practicing yoga is a great help. It's best to start with a good teacher, someone who teaches it in a very gentle way, nothing drastic. Mozartiana