Some really insightfull replies in this thread, its a pleasure to read.
I would also add, ask yourself if you want to quit drinking, if in a perfect world, would you still drink? in a not so perfect world would life be better without alcohol? Would you like to be able to better control your drinking? If so, why cant you do it already?
I cant speak for anyone other than myself, but for me, I know I dont want to drink, yet im sometimes compelled to do so. This runs contrary to what I want and despite me being solely responsible for me, it still happens.
FWIW, I dont drink pints of hard spirits or have ever experienced the kind of withdrawal that would need medical assistance, but I too have blackouts, I drink to "relax" after a days work, etc... but similar to you I find things go bad when I do that. Im tired of causing myself literal and metaphorical headaches.
Ultimately though, it boils down to what we personally want. Do you want to stop drinking?