You both are in a really tough situation, and it is great that you support each other.
Keep looking for an adult that you can trust for some advice. Some suggestions: teachers, coaches, and pastors. I have worked in schools and you would be surprised at how much teachers want to help - even the tough ones. But you have to ask them first. They can't just come out and say 'Tell me about your alcoholic parent', although many can tell when students are going through stress.
Look for those alanon and alateen meetings. A friend of mine attended a alateen meeting as she was interested in starting one for the kids in her home town. She was blown away. The adults were there to supervise, but the kids pretty much ran the meeting. There was lots of great sharing and everyone had a chance to talk if they wanted to. Like any alanon meeting, you can just listen and you don't have to talk.
And of course, keep posting here with your progress, frustrations, rants, and little celebrations.