If you don't mind me asking, what drugs are you on? Any supplements or herbs? Always look to drugs, or food, as a cause of new symptoms.

Do you eat salt? How much? Salt can raise BP. Also, sodium and potassium work synergistically together. Has anyone done a FULL chem panel on you, in the morning while you are fasting? Have they checked any endocrine functions, such as thyroid, parathyroid, cortisol, etc?

What did they find with your kidney function? Did they find something on urinalysis or BUN (blood urea nitrogen) or creatinine?

One of the most common kinds of kidney issues is renal artery stenosis. You don't have to have only a "heart" narrowing to have your BP get higher.

Do you stay well-hydrated?

I hope your doctors will be thorough. Changes in fluids and electrolytes are not simple things. They can be very dangerous. Not a lot of doctors "get" that. I hope you will revisit all this with your primary doctor. Maybe get a referral to a nephrologist (kidney specialist) if you have a kidney problem for a 2nd opinion.

I hope you get it all worked out.

Annie