There are tons of groups out there on the web, aol, yahoo, a couple of list serve places, a couple of non profits run general and specific cancer boards. This is the only one that is monitored for content. While there are some good people, and people that need people on other places, this is the one that the posts have to past muster to ensure no one will be hurt by the advice, and that it is as accurate as the nurses, doctors, and survivors who monitor it can ensure.
I have had neck and jaw cramps and more since my treatment. What you have described sounds normal when compared to my personal passage through it all.