Unexpected Medical Bills

I have MM cancer. I am receiving Infusion once a month.   They infusion center never billed me until recently.  I thought the insurance would help. They did. But not enough. Now I am strap down to keep up with my once a month income. 
Please I don’t like to ask for any help. But My back is up against the wall   I would appreciate any help I can get now. 
Thank You so Much, Frank Gates