Excessive irritation/Soreness in throat.

Hello Doctors, I was suffering from a throat allergy on 2nd May so I consulted with an ENT Specialist & he prescribed Telecast F tablet for 2 weeks & Refzil O 500 for 6 days. I completed my prescribed dosage on 17th may but after that my Throat & mouth gets totally dry & I am having salivery deposits/Layer on the surface of my tongue. I am still feeling excessive irritation on my throat as my throat is stuck with white mucus...sometimes i also feel burning sensation & a little pain  on my chest as well as in stomach. This feeling comes just after having a meal & i can feel sour & bitter kind of thing on my throat.....I dont understand what is happening with me..I cant go to hospital as i have asthma also so i dont want to go outside..i am very much worried..i dont have fever, cough, difficulty breathing etc...but I have nasal congestion and sometimes headache also. please help me find the right solution for my problem.