Bad cough phlegmish & flu in 3rd tri

Hi mummies, anyone encounter very bad cough for long period accompanied by flu then on and off sorethroat before. I'm going thru so much pain coughing apart from being shortness in breathe. This is really starting to annoy me considering I'm 4wks away from giving birth. What can I do. I'm so tired of the cough n phlegm especially