Fling yourself into
Definition 1 of 2
Pro Tip 1/3Context Matters
Use the phrase for positive activities or goals that require commitment. 
She flung herself into volunteering at the animal shelter.
Pro Tip 2/3Emotional Shift
Often used when someone needs a change after an emotional event. 
He flung himself into salsa classes to recover from his loneliness.
Pro Tip 3/3Intensity Implicated
Implies doing something with a lot of energy or intensity. 
I flung myself into organizing the charity event.