Hi Ann,
What you described is classic symptoms of anxiety. That said, you should still check with a doctor just to be sure. I often get stiff muscles in the back of my neck and shoulders. My throat tightens up, too.
I remember reading somewhere that this is a symptom of anxiety and cannot harm you. There is even a medical name for that feeling you get in your throat (I forget what its called - its not important). Its totally harmless, so don't worry about it. Try to do something to help ease the tension in your muscles. A relaxation tape might work for you (if you can't find one, let me know, I have a few on my pc).
Brad