Is rehab really worth the money?

I’m a 25 year old male alcoholic. I’ve hit my rock bottom. Lost my girlfriend of 4 years who I had bought a ring for. I have a fatty liver. I’m very emotional knowing I need help to quit drinking because I honestly don’t know how to stay sober. And my mental health isn’t great. The price tag of rehab is expensive and I’m curious if you guys think it’s beneficial? Or are there other methods?