Final answer:
The patient's symptoms are suggestive of primary hyperaldosteronism, characterized by excessive production of aldosterone and resulting in hypokalemia and metabolic alkalosis.
Step-by-step explanation:
The patient's symptoms of hypokalemia, metabolic alkalosis, and decreased renin activity are suggestive of primary hyperaldosteronism. In this condition, there is excessive production of aldosterone by the adrenal glands, leading to increased reabsorption of sodium and water in the kidneys and increased excretion of potassium. This results in hypokalemia and metabolic alkalosis.
Other possible causes, such as renal artery stenosis, Cushing's syndrome, and pheochromocytoma, do not typically present with the same combination of symptoms as seen in this case.