He may be able to get Otrivin
nasal drops over the counter from a pharmacy,as well as painkiller Brufen
tablets 400 mg.let him take this thrice daily for 3 days and put the nasal drops twice daily 3 drops both sides for 5 days with head well tilted back followe by steam inhalation after 5 minutes.If this does not relieve the pain,he may need th see an ENT specialist
.he will need antibiotics and steroids
which may need a prescription in a strange country.