My potassium level is at the top of the range, and I understand that it is not good to have high potassium?
It sounds to me like your blood potassium level might be at the high end of the normal range. Hyperkalemia is when the potassium level is greater than 5.0 and can be associated with Addison's disease. Alternatively, hypokalemia is when the serum level is less than 3.5 and that can trigger dangerous cardiac arrhythmias.
A potassium level in the high normal range is acceptable, and, as a cardiologist, I like it. I don't know if you are taking potassium as a supplement, but your doctor should be checking your adrenal glands and monitoring your potassium.