I would give him some infant ibuprofen and take him to the doctor. He may have an ear infection if he is tugging at them and they would rather see him and know it is nothing than not see him and miss something iykwim. Try calling some GP clinics and you may find one still open. If not try nurse on call 1300 60 60 24 and they will be able to help you decide what to do and where to go, especially if you explain you are on holiday and don't know any of the local clinics.