Hello, Dr. I Have A Few Health Questions. I Have

Hello, Dr. I have a few health questions. I have hep. C & B. I found out back in 2010. Lately I have been sicker then usual. Very tired, my liver Quivers, my stolle is black. I FEEL LIKE I GOT THE FLU BUT NO FEVER. AND I FEEL nauseous. ALSO, I AM A ADDICT. I have been doing drugs for about 20 yrs. On and off. Some times, I have been injecting Chrystal meth. I have not done this in about 3yr. I have more energy and can do more activity. Any ways my question is, for about 5mths since I started back ( which I wish I never started) I have very bad vision. When my eyes dialect (pupil big) I am in like a tunnel with fogg. Then when my eyes R normal I can't see very well very blurry and my color So of course if meth is the cause of this I have to quite. So do U think once I quite, this problem will go away or will it cause permanent damage?
One more thing before I let U go, what R some food or drink I can take that will help my liver and to build up my immune system? I thank yuo so much for taking UR time to ready my letter. C.B.