Your son has alergic rhinitis that's why he has cold in the morning.
He needs to stay away from dust .
Keep his room clean.
Can use mask when going out.
Fatigue can be due to dehydration.
Drink plenty of water with ORS ( mix one packet in 1 little of water and drink 3 packets per day for a week or even more).
Have healthy diet.
Can take tab levocitrazin 5 mg at night for a week.
Take vit c with zinc chewable tablets everyday one tab.
Next Steps
consult me if possible for you.
Health Tips
Add Antioxidants and antiinflammatory foods in his diet like tomatoes, nuts, cereals, turmeric, green leafy vegetables and fruits, ginger, vit c rich foods like awla, orange, lemon.