Although not a quick fix, there is something that I think might be able to help a little? You seem like you are a very “emotional” person? You go through a lot of mood swings, either really happy or sad and depressed, and a lot of the time your sad is when your mother is home with you? I don’t know if you are a spiritual person or not – I wasn’t, but the more things happen, the more spiritual I’m getting…
I might guess that a lot of your sadness and lack of motivation and confusion isn’t entirely all yours, and a lot of the pressures and hardship of life that your mother feels, you are soaking it up. I’d really suggest you do some reading on some meditation. You don’t have to sit around and hum, but just find something where you can clear your mind and block everything else out. By blocking out other people’s emotions you might find a bit of clarity and feel a bit happier?

I’m sorry for the stuff that you have gone through, you really didn’t deserve it.