1. The patient is a 68-year-old male who presented with headaches and high blood pressure readings over the past two weeks. On examination, his blood pressure was elevated at 159/92 mmHg. 2. The main diagnosis is essential (primary) hypertension given the symptoms and elevated blood pressure readings with no identifiable cause found. Differential diagnoses considered include renal artery stenosis, chronic kidney disease, and hyperthyroidism. 3. Labs, diagnostic tests, pharmacologic treatment with hydrochlorothiazide and lisinopril, and non-pharmacologic recommendations including lifestyle changes and follow up in 1 week are included in the treatment plan.