Bless your heart -- I know how hard living with depression is, because I've been depressed siince I was a very small child. My parents didn't do anything about it because they were too busy getting drunk. So I didn't get treatment until I was in my 20's and married.
I'm sorry the bird died. We become attached to pets very easily and it hurts when they die. We have to mourn their passing, just like we mourn a family members death because they WERE a member of the family! So you will feel badly about it for awhile. And so will your brother.

Try and help your brother thru this, and I'm sure it will make you feel better if you help HIM.
I'm glad you're in therapy or have BEEN in therapy. I hope you continue. I wish you the very best. Please keep posting too, will you? It helps to get things out and get others opinions. God bless and hope we hear more from you. Hugs, Lee