MSRA-0374
A 38-year-old man visits his GP complaining of feeling generally unwell. He reports experiencing daily frontal headaches for the past three months, which have not improved with regular paracetamol. Additionally, he has noticed some unusual symptoms such as his wedding ring no longer fitting, his shoe size apparently increasing, and a small amount of milky discharge from both nipples. During examination, his blood pressure is found to be 168/96 mmHg. What is the probable diagnosis?