Thanks for providing additional information.
I understand your concern and it's my pleasure to help you in every aspect.
As per your description,it suggests the possibility of Upper respiratory tract infection.
And as he has history of hypertension so he can take Mucinex DM or
Coricidin HBP Chest Congestion & Cough.
Also drink warm liquids.
Do saline gargles.
In case of throat pain,betadine oral gargles can be helpful.
Take OTC Tylenol for headache.
Avoid fried,spicy food.
Elevate his head side of bed and use a humidifier in his room.
And consult his doctor if his symptoms'll persist.
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