I think you should keep trying. I had an eating disorder once, which is considered like an addiction in many ways. I was on a high from getting thin, but it wasn't healthy. I tried to learn to eat again without panicking. It was hard. I failed many times, but I kept trying, and after every failure, I started again and kept trying. Eventually, the failures became fewer and the life I wanted became more of a reality. A long way down the road, I realised I was stronger than I thought and I didn't need to be afraid of losing control again. I guess my brain chemicals sorted themselves out slowly, too.

Just keep trying. Think how much money you'd save over a year if you manage to quit completely!