Sorry that you were abused by your brother. Sorry for your loss.

It's a difficult time for you. Take your time. Write about it. Kudos for joining a support group.

But it would be a good idea to see a therapist as well, if you are not seeing one already. Death of your abuser can be a confusing time.

My father abused me and on hearing about his death, the first thought that came to my mind was "Good...he won't molest anyone anymore". I felt being pulled on 2 extremes of love and loathe.

Some time after that, I fell into depression, because I felt like a bad daughter who had no option to redeem the relationship (I wished for his death).

You are having trouble sleeping. Maybe it's a good idea to talk to your/a therapist, till you feel comfortable.

You'll find loads of support in this forum too. All my love.