Dear Ashraf,
Let us at first hope to u fast full recovery......
In addition to above,may here I can suggest to read the follwing article that in relevant to office ergonomics..........
Thibodeau PL and Melamut SJ. Ergonomics in the electronic library. Bull Med Libr Assoc. 1995, 83(3): 322329.
*Free soft ware for stretching:
Stretch Break for Kids - Pre Download Form
Hope this could help.............