I'm Eating A Banana At Work, And Every Time I

I'm eating a banana at work, and every time I swallow there's some serious pain in my back on both sides. It's been sore for a while. And I'm generally in a lot of pain, so I guess I didn't notice it getting worse. Cause it's sore but then when I take another bite it gets worse for about 30 seconds and then calms down again.