Idk if it’s literally grey out or where you live but getting kinda depressed from vit D deficiency is so common and such an easy fix nobody pays attention to. Best options are from sunlight or food (sardines, liver and shiitake mushrooms have a bunch), but a supplement works in a pinch.
I was so sad the other day and realized I hadn’t been taking vit D pills and it had been raining pretty consistently for a few weeks. I ate a tin of sardines and felt better within a few hours!
There’s this great app called D Minder (lol) that can help you track if you’re getting enough (linked in post).