Phelgm (sputum) makes tight breathing.

Recently I was intake some delicious sweets.It makes cough that creates thick phelgm.when I was coughing it makes breathing little bit tight. I have gone through this problem last time also.but I was feeling better after I took medicines like ("Aerodil syrup and Allegra M) tablet as prescribed by the doctor!! 1)why thick cough makes breathing little tough sometimes..Sometimes I feel wheezing when I was coughing.After taking aerodil ambroxol syrup..It makes me better.. 2)is this happens regularly if we intake the sweets and cold items regularly...How to get rid of those tight breathing with thick coughing? Is thick sputum with wheezing leads to any trouble ? What we suppose to do if this happens again cough with tight breathe..is it OK if we intake proper syrup and tablets to get rid of those problem? .How to control that thick sputum with tight breath if it happens again Please give me your valuable answers