I had throat infection week ago and still I am feeling congestion in my nose and upper side of throat and also i feel irritation in my chest while breathing. I am not breathing freely i feel like making effort for breathing due to itching. I even went for lungs x-ray for which the doctor suggested me Acetylcysteine 600 to relax the mucus and Pentop 40 for GERD but after taking 2 days of dose I lost my Acetylcysteine tablets 4 days ago due to travelling and i am facing the trouble in breathing. So should i buy those medicines and continue the dosage of Acetylcysteine 600? What can be the cause of chest and throat irritation and accumulated cough in upper throat?