my mother gets botox injections every 6 months for dystonia. Her head shakes uncontrollably. They inject into the same muscles that they do for us. She has found that while they do continue to work, it takes longer every time for it to "kick in", and as it wears off it is far more painful. However, she continues to get them, as she feels that the benefits far outweigh the consequences. She lives in Alberta, and her medical covers the shots. I am in B.C. and I don't know if they are covered here.
I am going in to get a sympathetic block, when I see the pain Dr. I am going to ask him about those things.