Can you get to a meeting? It would really help you to have face to face and human contact right now.
The Hep C (IF you even have it) is treatable. There are solutions for the pregnancy too - there is a solution that you can live with in regards to a pregnancy.
One step at a time.
Don't use. Nothing is made better by using. Get to a meeting, or if you really feel in danger, go to a hospital and tell them what you've told us.