I Was Diagnosed With MS In 2009. Had A Second

I was diagnosed with MS in 2009. Had a second opinion from the Mayo Clinic in 2010 just to be sure. I have been on Copaxone for years. I have had only 1 new lesion since the initial onset of MS. A few days ago, I started getting this horrible pain down my groin area and left leg. It feels like I'm being shocked. It scares the heck out of me. I was just reading about leg pain on line, but it describes a similar pain that goes down your back, then into the limbs. I'm not getting any pain in my back with this. Nothing seems to help. I have tried to stretch my leg, and also tried walking.