I hear you!
You might try looking for local resources-- churches, a social worker at your local hospital, local government, to see if they know of any resources locally that could temporarily help with living expenses.
There is hopefully going to be someone who can help with transportation to and from your appointments. The American Cancer Society has the Road to Recovery program http://www.cancer.org/Treatment/SupportProgramsServices/index I do not know how many people drive four hours, but it's worth looking into.
The following link is a list of resources from a foundation for a different cancer than you have, but the list applies generally to cancer. http://www.lustgarten.org/patientmedicalexpenses
The Cancer Card Xchange http://www.cancercardxchange.org/ tries to gift around $100. in donated gift cards to cancer patients if their supply allows it. Contact Emily Thomas, http://www.cancercardxchange.org/p/referrals.html explain the situation, the cancer you have, show something that shows you have a cancer, list any gift cards you could use-- general debit card, Walgreens or CVS pharmacy, gas card, whatever will help with your expenses. Provide the name and address. Then send a thank you through her to the people who donate to let them know how much it's appreciated.
I cannot imagine travelling 4 hours every time you go to an appointment. Best wishes to you.
I hope more people post their ideas.