Definitely take him to a doctor, but don't be too worried. My daughter, 6 months (also unvaccinated), just had a cough and runny nose. I was pretty worried, and took her to our great pediatrician. She had a runny nose, and a nasty barking kind of cough, but no fever and was acting fine. It got a lot worse when we visited family and used their old humidifier. Our doc said it was probably from dust and other irritants from the furnace, and the old humidifier probably had mold on it. She told us to continue using our humidifier, and to prop her up while she sleeps, to let her sinuses drain. Since she sleeps with us, we propped up our bed by putting two pillows under the mattress, just like our regular pillows, but beneath. The first night we did this we did not have to aspirate her at all, and she has been getting a lot better. So have my allergies!