Equive has some good suggestions. I definitely think the school needs to work with you on these issues rather than just failing you. Have a talk with them and have your parents have a talk with them too. There should be options.

I got really depressed in high school and missed a ton of school. As a result, I graduated a year late. However, I took some courses at the career center during my last year, and this dramatically effected my thinking and influenced my life. I got into decent colleges in the area and it actually benefited my life rather than ruining things.

However, my depression issues didn't go away. The problems that hurt my high school career also hurt my college career. I wish that I had learned to talk with faculty and advocate for myself earlier, but I eventually did learn how to manage school and health. We all have issues and they often seem insurmountable. I know it can feel impossible... But there is a way. Don't give up. You'll figure out how to manage things for your situation too. The best advice I can give is to be proactive on this. And never, ever think that just because you've had problems in the past that you can't rectify things and make it work in the future.