I wouldn't say it's wrong, so much of poetry is personal preference.
Anyway, here goes my thoughts...
and in the day, I'm busy beyond need,
filling my time with mundane tasks,
to keep the flaring sadness
of your unwanted absence
from my mind.
Just a suggestion, Deb, rather than changing the second line/fourth stanza have you looked at how it fits in with last line of the third stanza?
I've just entered 'filling' as an example of how it could be changed it that area, hope you don't mind.