My Son Has Been Sick For 4 Month Now And

My son has been sick for 4 month now and our pediatric Doctor can't seems to help. He has a runny nose with constant congestion, wheezing and coughing all night long. Xray of his chest, sinuses and adenoids have returned negative for any issues. Blood work has been drawn for common allergies and anti body defincies. All negative. He has been on 3 round of different type of antibiotics with mild relief. A few days after antibiotic completed he returns back to his normal state or congestion. We use a steroid inhaler along with mucinex and nose spray and see no signs of relief. He is 3 years old. We have an appointment for ear tube placement, he has had fluid in his ear for 4+ Months (no signs of infection). I'm about ready to take him to the hospital for care until treatment is resolved. I'm stumped, frustrated and sad for my child.