I lost an older sister 10 years ago - I still feel a lot of pain about it now. Life will never be the same, and don't believe anybody who tells you it gets easier. It doesn't - it just gets different. It's like losing a leg - you learn to walk again, but you will never walk the same again. It'll change you, but for me it's changed me in a positive way - it's made me realise life is for living today. Your values, your material needs, your focus, everything changes.
It's the physical pain of grief that's the hardest, the numbness waking up in the morning and remembering, the family reunions which will never be the same (It took me a while to put a recent "family" photo up - because it just wasn't complete).
What you are going through is unique to you and I felt like nobody knew or could understand what I was going through. And nobody can; every relationship is unique, and your relationship with your brother was unique.
I don't have any coping strategies because they all sound naff, and to any suggestions you will think: "Yes, but I can't do that", or "That doesn't apply to me". I had a really close circle of friends with my sister and we spent a lot of time together after my sister's death, but that didn't even provide much comfort to me. You have to learn to live with the grief.
I don't mean this to sound negative, but just to say it as it was and is for me.