Help with cost of chemo and medical

I have CML (chronic mylogenous leukemia) The insurance company has decided to change my chemotherapy drug and the copay is over $700 monthly. I previously received copay assistance but there is no more availability due to the high demand of persons in need. I'm doing the best I can to support myself as well as my family but my medical bills are far exceeding my income and I can no longer afford my medication that keeps the leukemia from spreading or the continued expenses of doctors visits and additional medications. I have tried for several months to keep up with everything but being a single mom and the only income, I have now fallen behind on normal everyday bills to afford medicine and my mortgage. I do not like to ask for help but I have been humbled since becoming sick and realize I truly need help at this point in my life in order to save my life.