At some point or the other in life, you will eventually realize and have to accept this fact: there will be things that you cannot do anything about. It’s okay to try, it’s okay to pray; but at the end of the day, you are only human.
At such times, do what you can and allow everything else work out – give room for the pieces of your puzzle to fall in place. Getting yourself worked up over something you can’t change does not resolve anything. Leave it to God, let Him handle it.
“… Be still and know that I am God…” Psalms 46.10