Gabriele --
I know exactly what you mean when you talk about being unable to lift the arm above the head, or hair washing causing problems. I was drying my hair with the hair dryer this morning, and had to put my arm down for a few minutes! That is very depressing for somebody 6' 2" tall and 225 pounds. I even notice it driving. I drove about 250 miles yesterday, and I am paying for it today.
Still, a relatively small price to pay.