Re: it hurts when i take a deep breath! =(
To the OP, I am experiencing the same "mid-back pain" but on my right side. It's especially bad when I try to breathe deeply or hold my breath for a longer period of time (i.e. a yoga breath). I just had a thoraic x-ray done yesterday, and they will look to see if anything shows up.
I want an MRI though, but keep getting denied. Anyway, please let me know what else you find out about your issues.