How do (or have) you handle the loss of a sibling?

This is my tribute drawing to my brother that was given 2-3 weeks to live... No one can chain smoke & drink like a fish without consequences...Even though I expected it...it’s always a shock to ones system realizing that you’ll never see them again..,
If you have lost a brother, can u advice me on what u think the best course of action is?
Sincerely,
Shewolfiie