I know I have to stop drinking, since my divorce

I know I have to stop drinking, since my divorce I started drinking way too much beer. Now I drink from 12 to 24 beers per night. When I try to stop I can not function, the shakes and muscle spasms in my stomach keep me awake and from performing my job properly. The only thing that helps is more beer. I feel as though I will lose my job, my son and my life! The demon has me by the neck and there is nothing I can do! So helpless