Possible reason of this could be one of following
- Chronic Fatigue Syndrome
- some deficiency like Iron Vit D
Calcium Vit B or some minerals
- medical condition like hypothyroid
diabetes
- stress and anxiety or depression
Treatment will be based on cause. You can do following
- Blood test to check deficiency hemogram vitamins D and B minerals calcium potassium magnesium
- blood test to check
thyroid
- meet psychologist if stress is there
- healthy balanced diet and required supplements
- homeopathy and acupuncture are two good treatment options