Hi @MK05, let me echo @kattytee and welcome you to the forums. I'm glad you reached out to us today. If you're home alone, maybe a bit worried about work, it's natural for your mood to keep dropping. I agree with @kattytee, that sometimes the trigger doesn't really matter. What matter is what you do with a day like today.
Lots of things might be able to at least halt the slide, if not pull you around just yet. Of course they're all things you're unlikely to feel like doing right now 🙂 Going for a walk or run, reaching out to a friend, getting in contact with professional supports or helplines, having a clean/de-clutter. Things that remind you that you aren't really alone and that you have some control. The softer side of self-care can help too, the favourite movie or TV series etc.
How are you feeling about work tomorrow? Sometimes those thoughts can make it hard for our actions to lift our mood.