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The American Association for Cancer Research http://www.aacr.org/home/survivors--advocates/information-about-support-groups,-clinical-trials,-financial-help-and-fundraising/how-to-find-financial-aid-and-advice.aspx
has an article (this site above) that lists various agencies and associations that offer financial help or ideas on financial help. Check it out.
Also check out Cancercare.org They have links to "free" professional help to those with cancer.
If you are stage 4 BC you automatically qualify for disability from Social Security. In Nov 2002 I was told I had stage 4 and had 6 months to live if "I was lucky". I've been in remission for almost 9 years. With the right help you might see your kids graduate, get married, and give you grandchildren. Any thing is possible since treatment for this beast is advancing each and every day.
Let us know if this is any help. Good luck and never give up the fight.