For a few months, I had what felt like I would describe as low blood sugar. I was lethargic and weak And didn’t have the energy to get more than small tasks in the house done. I am 72 and take blood pressure medication now, but before that all started, I was pretty active all day every day. I went over my meds with my doctor and after a lot of reading, I suggested dropping the beta blocker I was taking. They not only made my blood pressure low, but my heart rate would frequently get and stay in the low 50s. I also started drinking electrolyte base drinks with coconut water in them by body armor, as well as an 8 ounce glass of apple juice when I felt particularly wonky. This seemed to help me get right on many days. I also can no longer drink coffee.😭 When I was feeling almost narcoleptic I thought it would help, but all it did was raise my heart rate to an uncomfortable level very briefly. I don’t know that my comments can help you much, especially without knowing if you take any medication. I have frequently found those to be my culprits, or at least a way to try and get on the right track. Good luck!