What Causes Painful Lumps On Muscles All Over The Body?

I AM 44 , FEMALE, I HAVE BEEN DIAGNOSED WITH M.S. AND FIBRO. I HAVE BEEN HAVING ALOT OF LUMPS IN MY MUSCLES ALL OVER MY BODY. THEY R VERY TENDER AND HURT ALOT. I HAVE THEM EVEN ON MY HIPS, TOP THIGHS, UNDER MY ARMS AND AROUND MY RIB CAGE. DR PUT ME ON BACLOFEN BUT I AM HAVING PROBLEMS TOLERATING THE MEDICATION. ANY IDEAS ON WHAT THESE KNOTS ARE AND THEY ARE NOT GOING AWAY. HAVE ALSO HAD THE MS HUG FOR SOME TIME NOW AND PAIN IN MY THORASIC SPINE THAt WRAPS ALL THE WAY AROUND MY RIB CAGE TO THE FRONT. SOMETIMES THE PAIN IS SO BAD THAT IT WILL CAUSE ME SHORTNESS IN BREATH DUE TO THE PAIN ON INHALEING. THANK YOU AND GOD BLESS