Castonitis

The urge to cast on (or start) many different projects all at the same time.

"Casting on" is a term used in knitting, when starting a new project, one would "cast on a new project"

"Itis" is used with reference to a tendency or state of mind that is compared to a disease. "creditcarditis"

Thus Knitter's have begun to use the word "Castonitis" when the urge to start many different projects at once hits them.

"After seeing all the knitted socks you've made, I've got a serious case of Castonitis!"