Too low potassium levels can bring on cardiac arrest. It can also cause mental confusion. I ended up in the hospital in early 2016. My electrolytes were all messed up. I’d been prescribed Hydrochlorothiazide and a potassium supplement for several years without any problems. My sodium, potassium, and magnesium levels were all too low, even with the potassium supplement. Once they got my numbers back to normal levels (3 1/2 days), they sent me home, and took me off both medications. One of the nurses told me that too much potassium was as bad as too little. They never did figure out what caused the problem.
One of the docs I used to work with said “potassium sparing, my @ss”.
It was your BP med. As long as your kidneys are good the risk of high K is minimal.