Child has cough, congestion, stuffy/runny nose, fever (101.5), headache, body ache and is red and swollen under the eyes, should I take him to the Dr?

Yes, if concerned. This sounds a lot like the flu/influenza- if your child is not eating or drinking normally then yes it would be good to see your doctor. Also if the fever has lasted more than 5 days or your child seems very tired/sleepy then see your doctor The doctor may not give you any medicine but will look for serious issues and give you peace of mind on what to expect.