First we have to know the cause of pharyngitis and treat it.it can be due to caries teeth,GERD,sinusitis with postnasal discharge.once consult the doctors related to these if your ent doctor is not looking for these.
Next Steps
you can use pantopn with domperidone once a day,salt water throat gargles 3 to 4 times a day gargling.but rule out above and then identify the cause