Awww...hope it is nothing serious! My best friend who was a cheerleader in high school and college had the same problems. She is ok now but every now and then, her old injuries still act up. She has calcium deposits in her shoulders now and according to her, very very painful.
Being an athlete has its drawbacks! I suffer from my old softball injuries every now and then. I just finished Zumbia class which I took for the first time and my old ankle injury is acting up now. 
Good luck!
