I don't know much about
the treatments for Hepatitis C, but it looks like there are treatments besides Harvoni. Maybe your insurance would cover one of them? Seems like your Dr (I would guess a PCP or GP) would be able to help you find a Hep C treatment you could afford.
Alternatively, I wonder if your rheumatologist would be able to help make the case to your insurance company that the Hep C requires treatment?
We are primarily a group of people suffering from Lupus, so don't know how much help we can be. Sorry.
This website does also have a Hepatitis Forum, maybe you could post over there and people with more Hepatitis experience could help you out.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2000DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde