Suggestion for An Idiom [duplicate]

Chasing two rabbits from the widely claimed proverb:

"He who chases two rabbits will catch neither."

Betwixt and between

Torn between the two tasks

Stuck in the middle

Double minded from the New Testament:

For he that wavereth is like a wave of the sea driven with the wind and tossed. For let not that man think that he shall receive any thing of the Lord. A double minded man is unstable in all his ways.

Moving farther afield:

Between a Rock and a Hard Place

By implication, Hemming and hawing

Between the Devil and me

I think you should go with "spread yourself too thin"

spread yourself too thin: to try to do too many things at the same time, so that you cannot give enough time or attention to any of them. "I realized I'd been spreading myself too thin so I resigned as secretary of the golf club"

(Definition of ‘spread yourself too thin’ from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Or, as Bilbo painfully explains to Gandalf, "Why, I feel all thin, sort of stretched, if you know what I mean: like butter that has been scraped over too much bread."