I am so proud of you reading that post! I know you're struggling a bit atm, but I wanted to also say that you are sounding so much more mature and completely different than you have done in the past. You aren't blaming everyone and everything else for the way that you are feeling - you have acknowledged that your situation isn't great, but you are trying to do things to change it. That's huge.
The fact you are staying to protect your Mum is completely admirable and I think it's so lovely - but really your brother sounds completely out of control and sounds like he could do with some professional help.
I also wanted to say that I've noticed you venturing out of your thread and posting on others recently, with really good, kind and caring comments. Just wanted you to know that I've noticed and it's so lovely to see. You really have changed and it's lovely..