Dehydration can also be brought on from vomiting and severe diarrhea. You can tolerate a 3-4% loss of body water. After losing 5%, you may develop dizziness, headaches and fatigue. When you lose 10% of body water, you can experience confusion, seizures and decreased or lack of urination....
Some of it could be some kind of post-viral fatigue due to COVID. I know many people that have experienced it and it is not unlikely that it shows different in different people. With your genetic background it is probable that you react to different to stressors. A good way to ...