Quieting the mind is sometimes hard to do and nervousness can be exhausting, even debilitating. But your news is awesome! You should be feeling sweet excitement - you've repented, and done what needed to be done. I'd suggest holding onto that feeling but getting prepared for the Adversary to be severely annoyed. Be sure to recognize his actions for what they are (red herrings to darken, discourage and dissuade).

Also, nerves are not always a bad thing. True thespians channel them into moving performances and they can be learning opportunities for self-awareness and growth. Brings to mind a talk given in a 2008 BYU Devotional by Gregory Clark called "Some lessons on Faith and Fear". https://speeches.byu.edu/talks/gregory-clark/lessons-faith-fear/

Also ponder on Psalm 46:10, and the counsel we are given to "Be still and know that I am God" (Psalm 46:10) and how the Saviour hushed the storm. Through it all, remember that you are doing a marvelous work for yourself, for your Ward, the people in your sphere of influence, your posterity... the list goes on. "No worries. Be very happy."