unbearable pain in the back under the rib cage?

starting yesterday, whenever i breath i have a extremely painful pain in my back under my left rib cage.
when i stop breathing, im fine, but when i breath i feel it again. i'm holding my breath as im typing this.
also, i caught a fever 3 days ago and the doctor thought i had mono or h1n1, it ended up it was just a sinus infection. I've been on pills it seems like the sinus infection is gone.

so if they any reasons why it hurts my mid/lower back extremely hurts when i breath, and if they may be connected to h1n1 or mono, please tell me :)

thanks
 
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