I hope you feel better after a good night's sleep and some food.
I try not to go down that path of those kinds of questions but I'm pretty sure they're common to everyone at one time or another. I just don't spend a lot of time with them - that's what gets me into trouble.
I'm careful what I read, watch, engage with when I'm feeling blue. Lots of walks outdoors. Nothing renews me like an hour walk in Nature.
Blessings.