You can do it! I like how you played it out in your head- sticking to a plan is easier when you rehearse it in your head. Don't let the thoughts of forever overwhelm you.Tell yourself I won't drink or think about alcohol in the next hour, minute, moment- whatever timeframe it takes! Good luck and keep coming back- SR is truly a safe, supportive place!
ps keep in mind if you drank heavily for a longtime you might need to seek medical attention... seizures are a real possibility during alcohol withdrawal... be safe!