A 30-year-old man presents to the clinic with complaints of headache, vision problems, fatigue, muscle cramps and muscle cramps and muscle weakness. He has been diagnosed with hypertension last year. His physical exam is unremarkable apart from BP is 155/105 mmHg. His laboratory investigations show serum potassium is 2.4 mEq/L, serum sodium is 155 mEq/L, decreased plasma renin activity and elevated plasma aldosterone concentration. Based on the findings mentioned above, what is the most likely diagnosis?