muscle spasm
"I had severe muscle spasms from either tearing or pulling a muscle in my back when playing with my son. I couldn't stand, breath, just lay down with out my back pulsating.  Went to a Care Now facility because it was the weekend, a doctor gave me Fexmid and inflammatory ibuprofen medicine. Within an 30 minutes I could feel my back muscles retracting. Flexmid also helps with my TMJ cause I grind my teeth at night sometimes."