You're welcome, it's not a bother really, I like to help
It's fantastic that you've been trying to stop on your own already, have you considered talking to your mum about it? If she was so supportive about your anxiety attacks then she'll be supportive of your drinking issues. If you don't want to tell her right now then you could just ask to stay with her for a little while, visit her. This might help you to fight the urge to drink because you don't want to look bad or different
And she's yout mother, she cares because she loves you, you do deserve to be cared for, everyone does. It's not your fault that you've made some mistakes, everyone does, what you have to do now is just keep fighting and become stronger.
What you're doing is a great idea, once you've reached a limit or goal you've set yourself then switch what you're drinking. This suggestion may sound a little weird but one of my friends tried it and said it worked, but could you maybe try non-acoholic beer, or once you've drank a bottle of beer, refill the bottle with juice or something non alchoholic so you can trick your mind?
Take care
Anna