Is worse than a bad day after a bad day in my opinion. At least when the day before sucked, the current "sucking" of this this day is nothing knew, it just sucks.
This ^^^ is what a bad day after a good day feels like. Just strolling along, feeling down, but used to it. Then theres a cliff, you step off and for a moment (a good day) things feel different - hopeful - theres something that simply feels lighter. BUT Just like wile e coyote, theres that brief gravity-less pause, and then...yikes! crash. ouch.
I always get this annoying thought in my head too, kinda like road runner mocking me, "meep meep, no more good days for you!" to the point when a good day still sucks cause I'm just awaiting the inevitable crash.
AND YES, I'm aware that I used the word "suck" a lot in this post, but it really is the only accurate way to describe most things I've experienced while dealing with Bipolar.