According to your initial post, the conclusion of the NAC (Nucleic Acid Test) conducted by the blood bank was negative for HCV RNA. While I agree that you should be followed up by a specialist (GI doc, Hepatologist) for confirmation, this is very encouraging news.
The most likely scenario is that you have been exposed to the virus at one time; but your own immune system was strong enough that you beat the disease. This occurs in approx. 15-40 % of patients. While you will probably carry the antibodies for many years, the active virus is no longer present. This does not confer immunity, and re-infection is possible at a future date. The specialist might want to run an additional NAC test for confirmation 6-12 months from now.
For more research on Hep B and C, review the following articles from the U.S. CDC:
http://www.cdc.gov/ncidod/diseases/hepatitis/b/faqb.htm
http://www.cdc.gov/NCIDOD/DISEASES/HEPATITIS/c/faq.htm#1b1
Additionally, feel free to post any further Hep B questions in the HBV forum; Steven NYer and Zellyf are well informed and should be able to answer your questions regarding Hep B.
http://www.medhelp.org/forums/show/223
From my angle, it looks like you probably dodged the bullet this time :o).
Best,
Bill