Oh my god! I’m so sorry to hear that. How old was he if you don’t mind me asking?
Yes, we have to find a way to cope and get on with our lives - don’t really have a choice do we? 
My Mum told me to accept that the pain will never go and to just live with it and bear it. No other choice otherwise we break
May Allah Ta’lah give your dear brother a place in Jannat, Inshallah.