Sore throat from last 4 months at night.

Hi, I am having sore throats from last 4 months at night. I did xray of chest and nose and everything one was fine, i did a blood test which says ige level was around 400 and vitamin d was little low. I also did sputum test and found klebsiella pneumoniae, and doctor suggested me to take ceftum 500 for 10 days. I also used sinopure to clear any nosal related issue. But still my sore thoat exists at night. My vourse of ceftum has completed. Is it due to ige 400, some kind of allergies or something else ? From last 3-4 days the sore throat is more and feels like sore throat with cough in throat, although the cough is white in color. I also am starting to feel dry on mouth like thrist which i am guessing is due to sore throat ?? The sore throat is always on night, but from last 3-4 days it happens to start from evening. Due to sore throat and cough generation more of, and thirsty i am feeling uncomfortable and diffculuty gulping, for which i have to drink water. Other then that no syntoms