It would be extremely difficult to get it through colonics. You would have to be bleeding and there would have to be HCV infected blood on the part they insert. I got hep. C in 1977 from a blood transfusion following surgery. I had no symptoms until 1998 or 99.
It usually takes 20 years to manifest symptoms. It is more chronic than fatal. Don't be scared. Fear is not good for your immune system, it produces cortisol and that is not good for your liever. You need to build up your immune system. 15% of people overcome hep. C without any treatment at all. Get some books on it and read up. With knowledge you will know what choices you have to make an informed (not emotional) decision. Thank the Lord for your life and this challenge. Best wishes to you.