What Causes Cold, Sore Throat And Productive Cough?

Hi Doc my name is Jash, 29, 5'2" in height, and weighs 102 lbs., married. I am having this dry cough since I was young and had a history of bronchitis when i was 1 year old.Just recently, Im having colds, sore throat, productive cough and excessive mucus that bothers me so much especially at night. I took muculytic syrup and capsules, natural cough remedies such as lemon and ginger but i think there's no improvement, Cough still bothers me and it gets even harder and dryer that sometimes i may experience tightness of the chest,and one thing that makes me worried is that we're in the process of having a baby. I am a year married but still wanting to have a child, Does having this (severe) cough would greatly affect of our desire to pregnancy?What are the foods that i need to get rid off that may trigger severe cough and foods that are healthy to the lungs?and if ever I am a week pregnant now then i happened to take this muculytic syrups does it affect the child? i am hoping that my query will be given clarity. Thank you so much doc.