Mr. JP (mаle, 60 yeаrs оld) hаs a histоry оf depression and has been prescribed phenelzine 15mg three times a day for the past 4 weeks. He is doing well with his mood and reports feeling much better. This evening, after a meal of mature cheddar cheese and a glass of red wine, Mr. JP suddenly experiences a severe headache, rapid heartbeat, and nausea. He is concerned and calls 111. What is the most likely cause of Mr. JP’s symptoms?