Rejoicing in the Lord does not have to mean an emotional experience.
It simply means agreeing with God, stating that you are glad He has made the right choice and agreeing to take the next step by faith because you have put your weight down on the Rock of Ages.
It is critically important to tell Him that He knows best and that you are glad, glad, glad. He will honor this and you will see the situation more clearly. You will begin to see things as He sees them.
You must do this aloud.
Then, look up and move on!