How can I get help for my medical condition when I owe so much money that I don't have?

A year ago I started to have pain in my rectum. I had no insurance at the time but I got help from charity care. I got a colonoscopy and had polyps removed. They said I had internal hemorrhoids and a fissure. I had operation for fissure and then later for the roids. I had insurance for the surgery but the insurance would not cover it. Meanwhile I still have pain and I owe thousands of dollars that I don't have. How can I get around this?