Please don't try to worry too much about it (I know that's easier said than done). You're not even certain that you have Hep C at this point. And if it was just a needle stick (not a shared needle) I know that the transmission risk goes down. I did know a guy who had Hep C. The doctors gave him a terrible prognosis, but he's alive and well years later. Sorry, I don't know if he did anything to try to get rid of it.
On a personal note, I was diagnosed with cancer 5 years ago. Every doctor I saw told me I'd die soon. I was freaked out beyond belief, so I understand your anxiety. Long story short, I consented to lumpectomy but refused chemo and radiation (even though the docs told me I'd die without it). 5 years later, I'm still here, and have no health problems from the cancer. (I have chronic pain, due to something else). So doctors don't know everything.
By the way, I'm pretty sure that Naomi Judd had Hep C and miraculously went into remission, through prayer or something. Pamela Anderson seems to be living well with Hep C. I'd be careful of Interferon; I've heard it's pretty much like chemotherapy and can damage kidneys, etc. Natalie Cole got Hep C from a shared needle and went on to have Interferon treatments. The Interferon ended up sending her into kidney failure, and she needed regular dialysis, PLUS a full kidney transplant in order to stay alive.
I'm not trying to tell anyone what they should or shouldn't do regarding personal medical decisions. I'm just saying to research your options VERY carefully, because doctors think nothing of pumping their patients' veins full of poison. It's really quite sad.
But try not to worry too much...hopefully you don't even have Hep C. And if you do, there are people who have survived it without resorting to Interferon.