I'm wondering if playing upright has caused what I'm experiencing. I've been playing upright a LOT lately, and I've been having pain horizontally across my abdomen, and into my back left side. The skin feels like it 'burns' when touched. The line that the pain follows starts approximately 1 inch above the navel, and goes a little bit to the right, and from left to back. It's a 'close to the surface' pain. Anyone experience this kind of thing from shedding/playing?