when you dream about your love one death . whats...

It is not a vision, it is bad dream as this kind of dreams come from the devil so to frighten you and make you sad. You have to blow on your left shoulder three times and then say, "I seek refuge with Allah from the accursed Satan".  Nothing harm will come to you, but you shall not tell anybody of your dream,  as our prophet taught us for such bad dreams. The prophet peace be upon him said,: “He who sees a good dream, shall thank Allah, and not tell other of it. And who sees a bad dream, then it is from Satan, then he should ask refuge from Allah and shall not tell anyone about it”