Maybe it depends what will happen. I believe it may be possible to change the outcome. However, if it means, someone will die, I think that is going to happen anyway and in Christian point of view death is not an end. That is why I think death is not something that we should worry.
He said to his disciples, "Therefore I tell you, don't be anxious for your life, what you will eat, nor yet for your body, what you will wear. Life is more than food, and the body is more than clothing. Consider the ravens: they don't sow, they don't reap, they have no warehouse or barn, and God feeds them. How much more valuable are you than birds! Which of you by being anxious can add a cubit to his height? If then you aren't able to do even the least things, why are you anxious about the rest? Consider the lilies, how they grow. They don't toil, neither do they spin; yet I tell you, even Solomon in all his glory was not arrayed like one of these. But if this is how God clothes the grass in the field, which today exists, and tomorrow is cast into the oven, how much more will he clothe you, O you of little faith? Don't seek what you will eat or what you will drink; neither be anxious. For the nations of the world seek after all of these things, but your Father knows that you need these things. But seek God's Kingdom, and all these things will be added to you.
Luke 12:22-31
There is no guarantee for tomorrow. That is why I think it is best to do today best that you can do. Tomorrows tasks are for tomorrow.
Also, what if you have misinterpreted the dream? I think in Star Wars episode 3 is great example of how dangerous dreams can be, if they are taken hastily, with wrong interpretation. In that movie Anakin Skywalker sees dream where his wife is in great pain and Anakin thinks his wife will die, if he doesn’t stop that. And to stop the death he is willing to do anything, which eventually leads to his wives death. If he would have seen the whole future, he would have done things differently, but because he saw only part and made wrong assumption, he eventually caused the death. Of course it is only movie, but I think same thing can happen in real life and dreams should be taken carefully, and not do hasty moves because of them.
It would be interesting to know, what happens in that your dream, because even if it may be unpleasant, it may also give something good that causes good things, even though something bad can also happen. Often many things have multiple sides that can be beneficial, even though some result is not very good. Most negative matters can be seen also from positive point of view or there can be seen useful things that cause more good than bad.
For example, if I would know someone who is important for me dies tomorrow, it would give me chance to be with him at the last moment, when otherwise I would not see him before his death.
Knowledge is always good, if you use it for good purposes.