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If its a hrdship that came on you, yes you will be compensated many folds for that in akhirat.
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Yes.
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No it does not mean that everything happens for our benefit. Allah is malik of khair and shar. A hardship could be a test or a punishment, who knows.
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Yes, all will be well in akhirat. This life is a test anwyays so no guarantee in this world.