Sunflower, welcome to SR. It's a shame you're in a situation that would make you seek us out, but SR is a great source of support and information, as it sounds like you already know.
Have you considered Alanon? Here's a link to help you find a meeting.
http://www.al-anon.alateen.org/ While this is a wonderful community, there are advantages to having some real-world resources too. Try a few meetings, pick up some of the literature. Here's a source:
Amazon.com: alanon: Books
You are NOT alone. The folks here and at Alanon understand. Keep reading, educate yourself about what you're up against, and just try to do the best you can each day. In time, you'll see your path clearly.