There are two types of evil in the world, moral (human) and physical. Evil exists because humans create it through sin. If God gives us the choice to choose good, he also has to give us the freedom to choose evil. If God took away that evil then he would take away our freedom. Your suffering is important and has meaning behind it. God has never promised us that we wouldn’t experience grief or suffering. However, he did promise that he would always be there for us through those tough times. “Into my hands, I place my suffering, make use of it.” Nothing given to God is ever wasted so give your suffrage to God.