I hear you <3
Something that helps me is to make the most of the "good days" to the best of your ability. There will be more bad days for sure, but there will be a day that is easier than the rest, maybe you're more clear headed? Maybe something made you laugh? Maybe you have a bit more energy than you previously had done?
Planning ahead has rarely worked for me, as it really just sets you up for disappointment. It's a cliche, but taking it one day at a time is really all you can do.
As a fellow person who is currently stuck in bed with crippling depression, I'm here anytime you need to talk! (I've got no where else to be haha)