I had pain in my left side from hitting balls at the range a few weeks ago, golfing right-handed. In the meantime I switched sides, now I play lefty. It's still a little sore, but doesn't bother me from this side. If I try to swing from the right side it's a different story though. So try to pick up a club or two for your other hand and give it a try; even if you don't permanently switch sides, it gives an interesting perspective and you're still hitting balls.