I'm reading The War of Art by Steven Pressfield. He talks of "Resistance" - an almost spiritual force within you that fights against you purusing your calling.

"Resistance Never Sleeps

Henry Fonda was still throwing up before each stage performance, even when he was seventy-five. In other words, fear doesn't go away. The Warrior and the artist live by the same code of necessity, which dictates that the battle must be fought anew every day."

Sound familiar?

Fight the battle today! It's worth it.