How do you treat your TMJ syndrome? What exercises? Any info. is appreciated.?

My mother has severe TMJ and fibromyalgia. This morning she could hardly open her jaw. She is in severe pain. She is going to a doctor, and has been to all the support groups. I am wondering what you people with TMJ do to control the pain. I will pass the info. on to her. Thank you. (she wears a splint in her mouth also)