Fruits and vegetables are the best sources of potatssium. You can definitely overdo it trying to supplement potassium when you low-carb, and even end up in the hospital (or worse). No wonder your pharmacist was confused.
Talk to your doctor instead. Here's the best thing about fitday: you can show him on the office computer (his office) exactly what you're talking about. Just pull up the reports of what you've accurately been eating. Short in potassium? It will show how short. And what have you been eating, by the way? Show him. And the reports that go with that.
That's what fitday does so well.Call me a report-a-holic...I'm constantly pulling up reports that show I'm getting 150% of my vitamin A requirement but 80% of my pantothenic acid!