Posted 5/7/2015 6:19 AM (GMT -5)
I did pilates for a few years before I started Lyme treatment. I know what you mean by core.
I also have costochondritis, but that pain goes all around the torso, like a belt that's being tightened.
Is it a very uneasy feeling just below the sternum? Whenever I get that, I can't lay on my stomach, there's some kind of intense pressure.
If it's a bit towards the right, it might be your gall bladder or liver struggling...
Marie