What Should I Do If My Infant Has Had A Blocked Nose And Coughing Fits For 2 Weeks, Struggling To Clear Phlegm And Breathe Properly?

Hi, My 6 month old has had a cough on and off now for 2 weeks. She is very blocked today and I am trying to clear it with the calpol nasel spray and the suction. She keeps having coughing fits where she is struggling to clear the phlegm from her throat and she can t breathe in because her nose is blocked. She ll be coughing straight for about 6/7 min and seems distressed durning this time.