Thanks for your posting. This is a very difficult situation and you are too young to deal with it alone. I suggest that, first, you get some counseling for support. You don't need medication; you need emotional support. You need to talk to a professional about how to handle the situation. To what extent have you and your older brother talked about it?

I am not a mental health specialist but it sounds like your mom might have a form of schizophrenia. While you don't benefit from meds; with this condition she will. My recommendation would be this: You and your brother tell mom that it's time she saw a doctor about this condition because she cannot treat the "bugs" inside of her body but an MD can. Make the appointment and alert the MD beforehand of the problem. MDs can prescribe. While your mom may not go to a psychiatrist, she can receive meds from an MD that may help enough to eventually convince her otherwise.

Put the bird in your room and get a lock for the door. Make sure your brother sees an attorney about the accident and is compensated to the max for his injuries, especially if they will disable him for life. Make plans to go away to college and get on with the most important thing - YOUR LIFE.