Hi Theresa and welcome. It is so overwhelming to have to even think about the expenses on top of your child's health isn't it??? Have you looked into state run programs, if your income isn't that high, you could qualify. But, there are alot of programs out there. Here are some links that might help you get started:
These links are from Norma Kennedy Plourde's website, she has accumulated a wealth of information about CF, interesting site to browse
http://www3.nbnet.nb.ca/normap/cfinsurance.htm
This link is from the CF foundation:
http://www.cff.org/living_with_cf/insurance_and_assistance_programs/