A 18-year-old man is referred with a six month history of dail | Neurology collections 2020

A 18-year-old man is referred with a six month history of daily headache which is mostly frontal in location and
occasionally associated with nausea. He has been taking paracetamol 3 g/day, aspirin 300 mg thrice daily and
codeine 40 mg thrice daily, which has only a temporary effect.
He has a two year history of depression, treated with paroxetine. No abnormalities were found on examination.
What is the most likely diagnosis?