Do you ever feel like you can't tell if it's a mood swing?

I've been in these states where I'm so depressed but I'm taking medication and it just doesn't make sense why I'm so sad. I'm so functional too. But I'm making bad decisions. I've drinking, vaping, using marijuana a lot. I eat like shit. I sleep but it's naps and then I'm awake or I sleep for 7 hours and wake up like I never even slept. I'm so tired yet so awake. I get so much done then crash. Then there's the wild thoughts. I can't tell if it's stressors in my life despite it being easy. Sometimes I feel like this for no reason and sometimes it feels like I just have to figure out the stressor. But really it's nothing. It's normal stess and maybe I can't cope with. Or maybe it's the weirdest depression ever.

Do you ever feel this way?