I'm tired of the whiplash

It's so frustrating how one day I'm functioning perfectly, walking up early, taking care of my hygiene, cooking meals, cleaning the apartment, washing dishes, showing up to work early, and then the next day I just... Crash. No energy to get out of bed, piles of clothes on the floor, no motivation to eat or take care of myself, just dragging myself to whatever the bare minimum is. I wish I could be more consistent, but BPD, ADHD, and MDD make it hard. I'm on antidepressants, which help a bit, but I still end up so exhausted.