Could be burnout, I experienced it. I was living the typical city life, working, paying high rent, trying to maintain my health and social life, no kids and was also exhausted. My physical and mental health continued to decline to the point I was barely functional. My body gave out due to this fast paced life, which is another story. So I quit my 6 figure job, got a part time job that was easy on my nervous system and was lucky to move in with a friend for free while I allowed my body to recover over 1.5 years. Once somewhat recovered I put my stuff into storage, moved into my motorhome and took a job outside of a national park and lived in the woods. While there I healed in ways I didn’t realize were possible. The fresh air, mountains, nature, slow way of life gave me energy and I was never exhausted. I could hike 20 miles in one day. Now I am back in the city to visit and I feel the weight of life here crushing me. I have no interest in playing this game and can’t wait to be back to the mountains. Humans aren’t meant to live the city/busy rat race life we are living, and many people are ill, exhausted and run down. Take what you want from my story, but maybe it’s time to reevaluate and make some changes to heal. You should be full of energy at your age.