I have had chest congestion and wheezing problems for the past three months. I am taking ayurvedic medicines for the same. Every morning, thick white phlegm comes out, but I do not have a cough during the day. I have some relief from cough after taking the ayurvedic medications, I got a chest X-ray, phlegm test, and blood test sugar test done, but all are normal. I have respiratory difficulties and loose stools. Why do I have chest congestion and wheezing problems at night?