Hello ma'am, I'm sorry to read about his troubles!
I would suggest consulting if your son's symptoms persist for 1 week without improvement, or if he has a fever for 72 hours.
In the meantime, if he seems to be in pain, Tylenol or Tempra is the first treatment. I strongly suggest that you contact your pharmacist who will be able to tell you the maximum dose according to his weight.
Nasal hygiene with a saline solution such as Hydrasense or Sinus Rinse, followed by suctioning with a nasal aspirator, is very effective for congestion, discharge and cough. You can do this as often as needed during the day and at least 30 minutes before bedtime.
Encourage your child to drink often, even if it means giving smaller amounts.
For the eyes, just clean the area with a clean wet towel, taking care not to share or reuse it as it can be contagious.
I hope I've been helpful, and I'm available if you have any other questions!
Sincerely,
Tom Samaha, pharmacist