Oh man, I remember going through exactly that during my pregnancy. It sucked so bad, it was on my right side though. I was hoping it would go away when my baby turned. Nope! Instead she put her foot in my rib the rest of my pregnancy. I never found a way to stop that pain. I just would massage the area. I laugh about it now but at the time it drove me crazy. Maybe ask your doctor if he/she has any tips.
I did. I had to go to the ER it got so bad. Ice, heat, stretching, and rest did nothing for me. The ER gave me a Motrin shot and told me to rest and keep taking Motrin. The pain completely subsided a couple days later. Hope you feel better!