Losing your mom to a year or two in jail is far less awful than losing your mom to death by alcohol. My dad is in prison. Prior to that, he was drinking himself to death. I much prefer him in prison. I can visit him, I can talk to him on the phone, and each interaction is not a drunk one.
I hope (but don't expect) that prison may change his drinking habits. If it doesn't, well, one of the conditions of his release is that he's not allowed to drink. If I report him for drinking, he goes back to prison. He does NOT want to go back to prison - he's got 8 1/2 years left to go before he's released.
Believe me, jail is far better than the alternative from what you describe.
The best I can say for you is that you have the strength to work through this, even if you don't feel like you do. If you didn't, you wouldn't be here now - you'd be drinking with your mum.
All we can do is make the best decisions we can with the information we have available at the time. You're not alone.
Gin