What Causes Primary Hyperaldosteronism?
Endocrine
Detailed Answer:
It is likely your endocrinologist has made a diagnosis of 'Primary Hyperaldosteronism', also known eponymously as Conn's syndrome.
Ask her if this is the case.
A common cause of this condition is a benign tumor of the adrenal gland producing excess amounts of a hormone called aldosterone. This typically results in high blood pressure and low blood potassium levels.
What she has done with you in terms of testing and treatment is fair, although surgery is an option. But that decision has to be made after due discussion with you and likely further testing.
I have noted your thyroid cancer history. I am sure she has that prominently in her mind while studying your chart records and making management decisions