Drudgery

This word, kind of lost its meaning, when karma yoga came to me. I do the boring, or “duty” stuff, not resisting it, not discussing it, just doing, and often it turns into a meditating work.
But still, on days when I do, what used to be my “domestic drudgery” I get the same feeling in my body, so I guess the change of attitude has to reach the bottom layers in me, before the physical feeling leaves? It’s like a lurking feeling, in my lower back, it’s not a pain but something like a “wear out”.
What can I do to release it now? My mind is blank, go to bed perhaps?!! Good night.