Do you know if there are success stories in staying sober after rehab?

Yes: I know quite a few success stories of staying sober after rehab. But treatment doesn't end after rehab. Most people with drug or alcohol dependance are helped by ongoing support to maintain sobriety. That can include ongoing care to treat depression or anxiety, 12 step groups, therapy, and a healthy lifestyle. Don't forget about exercise, doing things that create a sense of purpose and meaning.