HI, thanks for using healthcare magic
It is possible a viral infection as mentioned by your doctor especially with the history of acute congestion. In some persons the symptoms can lasts for a few weeks and the cough
up to 6 weeks.
There are other causes of throat pain such as allergic sinusitis
with post nasal drip
, reflux, trauma, rarely cancer.
If you are not comfortable then you should consider visiting another doctor for reassessment.
I hope this helps