As per the symptoms you have mentioned its a pharyngo tonsillitis
problem . It's a common problem becoz u have changed the place due to travel. Try antibiotic with amoxicillin
and clavulanic acid
combination twice daily for 7 days . Then observe , if it still persist and will have your lymph nodes enlarged , consult ENT specialist
. Tonsillar cancer is very very rare, don't thing about it and stop searching over Internet.