J.H.
It's probably allergies if he's not running an elevated temperature. Get a cool air humidifier and keep it in his room. If you can't afford that get him into a steamy bathroom. Another suggestion, saline water. Put a little salt into some warm water and blow it up his little nose using a nasal aspirator. It seems mean, but it works. He will cry, but you will be amazed how it clears ears, sore throats, stuffed heads and you can't beat the price. It's what we use during the worst of the allergy season. A doctor told us about this. Hope some of this helps you.
J. Hertenberger
Mom & Grandma in Austin, TX