High fever, Cold, Cough, Sore throat

I started feeling weak and had severe headache, mild sore throat, 3 days ago. On the 1st day night, I had headache and temp of 100. On the 2nd day morning, it rose upto 103, sore throat worsened along with body aches. On the 3rd day sore throat, cold, cough worsened even more. Despite medication ( Azithromycin, Cetrezine and Dolo 650 ) temp didn't come down. It was 101. Today I.e 4th day, the temp came down to 100 . But my throat is paining all the time. Pain while swallowing food or water. Nasal congestion is terrible, and all the medicines seem to have affected my gut(I have already been diagnosed by IBS), it has been paining severely sometimes in the lower and middle abdomen. Anticipating for diagnosis. Thanks in advance.