I have days that feel like that, too....
Heck, some days I feel like that two or three times a day - but feel great in between.
What you're describing in some ways is just part of the human condition.
Sometimes on days like that, I just pick one or two things, focus on those and get them done. Focus on ONE action to care for myself; a meditation, a gym session, a walk - and force myself to do that. Just power through, one step at a time.
hang in there.
