How long should you have muscle aches after a flu shot?

I got my seasonal flu shot two days ago. It started out ok, but then the muscles from the base of my neck, all the way down my shoulder, and down to about 3 inches above my elbow started to ache. I haven’t done anything other than get a flu shot (no muscle strain or anything like that), so this has to be related. Problem is, its not abating any (even with Tylenol or Aleeve) and favoring my arm and shoulder like that, especially when I sleep, is making me hurt elsewhere.

Have you ever had anything like this happen? How long did it last? Was there something that you took that really worked/helped?