I can relate to getting enormously stressed if something doesn't go how I thought it would.
Now I take a moment beforehand to think "What if it doesn't go how I think it will?" and remind myself that it probably won't be the end of the world.
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Music Theory 101: Cadences.
Authentic cadence: V-I
Plagal cadence: IV-I
Deceptive cadence: V- ANYTHING BUT I ! !! !
Beethoven cadence: V-I-V-I-V-V-V-I-I-I-I-I-I-I-I-I-I-I
-I-I-I-I-I-I-I-I! I! I! I I I