Yes, I have definatley pulled a muscle. It goes all down my arm and up into my ear, feels very wierd and so painful. The chiropractor says it happens a lot to people who are on the computer a lot, and well, that's me! He said that it wouldn't last very long. I have excercises to do and am to put ice on it and it will be better soon. I'll go and visit him again tomorrow before going to work.
Thanks for the prayers!