I can't give any real advice here... I hope your IC is helping you with your family issues. It seems to me they may have a lot to do with "everything".
You brother is right about one thing though... as long as you are leaving to find yourself, it's good. Any other reason, not so much.
Before your brother cosigns, make sure you KNOW that you are going to be able to pay the rent! It's an act of trust for him to cosign for you.
