Throat pain since longtime (on & off)

I have on & off throat pain since many months. Generally when I drink cold water/ ice cream immediately pain starts. Now I avoid cold drinks but having on & off Pain and sore. Many times visited to ENT doctors and antibiotics taken then problem solved but again pain starts in 1/2 months. I am doing regular gargle of salt warm water but no results. Also previous ENT doc had given me 1) Polypod CV200 2) Ace Proxyvon 3) Nice Tablet Was worked but again same problem after 2 months along with too much sneezing and acidity and then doc had given below: Oratil CV250, Zerodol SP, Bilagra 20, Rabekind DSR Problem solved but now again since 3 months having on & off sneezing issue and throat pain, doc suggested Azeflo nasal spray and I took sneeze stops and when start, I took this spray and I get relief in throat too. I take myself Zerodol SP when pain and also I take acidity medicine (as per doc) Now a days I talk over the phone more than 6-7 hrs because of my profession. Kindly suggest me.