A rollercoaster. It was dropping until the cheese thing, which I think is just normal, unspoken behavior. Sounds to me like a bout of depression, or at least what I think is depression. I 100% get the same lethargy to life, and it tends to come in waves.
If you haven’t, I’d look at having a chat with a professional. I’m not a good role model for this, but I have pushed through the lulls more times than I care to admit, and it gets tougher every year. The negative thoughts set in and create this negative feedback loop that makes functioning difficult, and digs a hole that’s hard to climb out of.
Anecdotally, if this is new to you, it doesn’t make for a happy life. I’m working to get help, but there are roadblocks. I would encourage you to try the same. If it doesn’t help, then you can cross that bridge later. If it does, then you’ll be in a much better place and the light will shine again.
…or the Internet really is just shitty.