Mam the symptoms that you are describing are suggestive of
Chronic fatigue syndrome..The cause of the same is multifactorial like work related, some viral infections, vitamin and
mineral deficiency and abnormal lifestyle.
Mam in your case lifestyle changes may be the important cause
As per treatment consider the following
1. Drink plenty of fluids
2. Consider daily intake of fresh fruits and vegetables
3. High protein diet will help
4. Daily exercises mainly to improve endurance
5. The exercises must be graded
6. Intake of multivitamins mainly consisting of B1,B2,B12 would be helpful
7. Few antidepressants like
Bupropion and
Sertraline would help but after consulting
8. Newer drugs like
Modafinil have been approved and may be started after consultation