Is this right and what can i do?

My mother has a certain drinking problem. She is not an alcoholic as if she has no money to get the alcohol, or has a choice between wine or things for her children she will get get things for her children. But she has this uncanny way of when she does have alcohol and is able to afford more, she can't stop. For example, say she has one glass of wine...but then she finishes the bottle, works out that she can afford another two bottles without putting her family in dire striates so to speak and gets the two bottles.

Now that's her choice as far as i'm concerned, ut i've realised a pattern in me. When i haven't taken my medication, or i am feeling overly depressed, or on the rare occasion i am asked out with friends to a club i can't seem to stop at one or two or even three i have to keep going until i am drunk. The worst memory i have is actually drinking myself sober and explaining to the police that my friend was drunk and i was taking her home. They didn't even wish to breathalise me as i had drunk that much alcohol my body just shut down and thought f*ck it she can manage so to speak. I contacted my local alcohol anonymous but they wouldn't accept me as i'm not classified as an alcoholic, but no matter who i speak to or where i go i can't seem to find anywhere which accepts 'binge drinkers' such as my mother and me.
Do anyone on here know any links from the UK or thereabouts where we can both get support? Possibly some tips on how to say no to the second drink and go home early?
or..on off chance, a website for people all over the world to offer support?

Thank you in advance :)