Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
May Allah accept your brother in Heaven and shower him with His Mercy, Ameen.
Mourning the loss of close family members or friends can take a toll on us indeed. We are humans with emotions and feelings and this is a normal phase that we all will pass through when we lose someone. Even the Prophet (peace be upon him) had tears for the loss of his son Ibrahim.
Faith never change things destined by God to happen, but faith always helps us cope with loss and it processes grieve for us in a way of patience that helps us heal. The only thing that can help you is your faith in Allah and that he will be in a better place insha Allah. Death is not the end but rather a phase to move from the limited to the eternal life.
I advise you to read Quran and make good deeds in the intention on his behalf for it will translate Hasanat for him with God.
Almighty Allah knows best.
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