All I Am is Tired

All I am is tired anymore. Since returning from our trip to Panama nearly four weeks ago, all I've done is is work on workdays and veg other than that. My weekends have been mostly full of sitting around. Today I couldn't even manage to sit around all day; I took a nap for about 3 hours mid-afternoon because I was so tired.

What's going on here? Do I have long Covid? Do I have some other sickness condition that's sapping my energy? Is it because I'm depressed from my work situation? Did I suddenly get 10 years older in the past month? Or is it just because I've been a sloth the past few weeks and now this is my new energy level?

Either way, I'm not liking it.