Low potassium

Found this on-line which explains what happens when your potassium is low:

Symptoms of hypokalemia include irregular heartbeat, which can range from mild to severe. Severe cases can result in cardiac arrest and paralysis of the lungs. Other symptoms can include muscle weakness, cramping, or flaccid paralysis (limpness); leg discomfort; extreme thirst; frequent urination; and confusion.

Poor Phoebe! :o(

Hers wasn't terribly low, just enough to need pills for 4 days, but still, I hate to see her weak.