I suggest you give yourself a break already. Relax, enjoy yourself.
Moms are the only species on the planet who think it's unforgivable to have a free 5 freaking minutes. We give everyone ELSE time/space to veg, but *WE* alwaaaaays gotta be doing something.
(This is more for me than you, of course. I'm battling the guilts every minute of everyday having Time To Myself. All those years of going full tilt 24hrs a day ought to have earned me DECADES of Time To Myself, yet here I am secretly feeling lazy and unproductive, sigh)
Like everyone else says, if you MUST do something you've been *meaning* to do, pick one project a day.
:)