How can I stop relapsing?

Im addicted to cocaine and many different pills. I decided to quit cocaine after overdosing on new years. I relapsed just a few days ago. I was doing so well. I haven't slept or ate anything since then and I can't stop using. I am afraid to get help. I don't have any family, or anyone that cares about me for that matter. I feel so alone. I don't want to die a drug addict.
How can I stop relapsing?
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