My 4 year old son has been sniffling for 3 weeks now. WE went to 3 doctors. The first doctor said it is probably from a cold and will go away. The second doctor suggested allergies during this season and gave over the counter meds (did not work at all), The third paediatrician gave us a prescribed steroid nasal spray and things are still not getting better. The only time he does not sniff is when he is sleeping. Our family (mom and dad) have no allergies in family. Please help.