From the age of seven till twenty, slowly watched my mother die of Leukemia. Later, over the course of nine months, watched my wife die of stomach cancer.
While cannot feel what you do, am somewhat aware of what happens in the process of enduring, treatment, and recovering from cancer.
My own life, due to my own health, has kept me a prisoner within my own body, with various limitations, that have ebbed and flowed, depending on age and circumstances.
Your path is difficult, my dad, who was a pharmacist, said on more occasions than one, "Anyone who finds a pill or something that eases the pain, is lucky." May you be so lucky.
The way forward is both one day at a time, and at times one moment at a time. Enjoy the steps forward as best as you can. The alternative, at least for me, is worse than dying.