R.R.
Sounds so much like my nephew, who is now 10. No smoking around him either, yet he was constantly sick from the time he was about 9 months old, nose running, coughing, gagging on thick mucus, etc. The doctor said it was viral infections, which antibiotics do nothing to help, and he was just more susceptible to them than most of us. Since we all build up resistance to antibiotics the more we take them she was hesitant to prescribe them unless absolutely necessary. My sister also was an antibacterial fanatic at the time, the doctor told her to stop using antibacterial cleaner everywhere and everyday, go easy on the antibacterial wipes and hand sanitizer, that he needed to be exposed to germs to build up immunity to them.
He's been on Zyrtec since he was 11 months old for his allergies, and developed asthma, I don't know if it was due to all the viral infections or vice versa, and is actually home sick today for the 3rd day this week with a cough that will not go away. He had been sick with what seemed like a mild cold, but it seems the mucus has lodged, causing the cough, again. BTW, he also has not been able to play organized sports, his doctor won't release him to play, so has taken up Tae Kwon Do which he loves.
I know it's hard, and I don't have any specific advise, I just wanted you to know that other moms and children go through this, and it's the pits ~ {{HUGS}}