Havana syndrome is real. One gloomy day in Boston when I had to work in grocery store I just can't. Feeling out of energy, depressed, melancholic, just couldn't take it. So I called in sick 5 minutes before the shift, hang out in the food court, ate Panda express by myself then go home. Must be Russian telekinetic weapon that made me feel bad that day. From my experience, taking a rest and eating greasy chinese food help. Hope you feel better as well.