My son Justis is fighting a very rare cancer

This is my son Justis, He is disabled  suffering from multiple debilitating mental disorders. He has fought through to become self sufficient over the last year. In december he started having trouble breathing, after 4 trips to emergency and being sent home, the morning of the 4th trip he almost died was rushed to the hospital. surgery to trim a blockage in his airway turned into a very rare small cell carcinoma of the layrnx . On April 19th my son was diagnosed with cancer. He has fought hard during a very aggressive treatment plan involving chemo and radiation. He can't eat, drink and can barely talk. Then on tuesday he was admitted with bacterial pneumonia, a life threatening condition. 
Although his insurance has covered his medical, and no matter how hard i've resisted asking for help ,, I can't do it alone anymore. I have been a single dad for ten years and have a daughter in college as well. 
i've missed so much work i can no longer keep the bills and rent paid. 
I really hate asking, but anything would be lifesaving at this point. He also has a trach in his neck and a feeding tube because he cant eat or drink at all.