Discussions that mention potassium

High & Low Blood Pressure board

Well the problem is, plain water isn't good enough. You will need salt, potassium, and even magnesium. Which can all be found in gatorade. Just drinking water will actually help flush the last two out more. Being low on those would contribute to that heavy tired feeling in your muscles.

But, since you're on all those medications, a call to your doctor's office wouldn't hurt. If their PA or nurse is in, they could probably help or at least try to get your doctor to call you back when not busy. Better safe then sorry. ;)