People often have fear related to what is unknown in their future. Due to anxiety caused by fears, people often try to control situations and other people. Letting go of expectations can be difficult, however, it is when we do so that we are really in control. When you are able to let go, your ability to embrace uncertainty will increase dramatically and your unhappiness will decrease dramatically.
We can look for the gifts in all that happens to us in life and it will minimize our suffering. We can find a way to be in the world that allows us to see uncertainty not as something to fear, but as an enriching aspect of life.