19th June 2023

A 57-year-old gentleman presents with a 10-day history of new onset headache, nausea, and vomiting. His headache is worse on lying down

A 57-year-old gentleman presents with a 10-day history of new onset headache, nausea, and vomiting. His headache is worse on lying down and is painful on both sides at the back of his head. He has no visual disturbance and no focal neurology on examination. He has never had a headache of similar nature or intensity before. He has been taking regular analgesia for it but without any effect. He reports having financial stress at home and is not managing to sleep well. He has no past medical history and does not take medication normally other than paracetamol and ibuprofen as required over the past 10 days.

Which one of the following options is the most likely diagnosis?