I think you need to talk to someone outside your family. I know it seems impossible and that the solutions offered are really bad for you and your family because you'd probably end up in foster care but if the situation is serious like that, it's important. You could have had serious head injury.
As for the self-harming, you are hurting your mother but if you have to resort to it to cope with the things in your life, it means something is wrong and that it needs to change. It might have to do with all the arguments.
This is a very complicated situation to deal with but I can only advise you to please talk to someone. A teacher or a school counsellor would be a good start. If you feel you can't speak directly to them, writing a letter is an excellent alternative as it permits you to work on it to say exactly what needs to be said.
Whatever you do, don't stay silent.
I also advise you to look into the abuse forum. You probably can get better help there than I can give you.
Take care
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