Hi there Anxious Lion. Operagal is right about
potassium. Bananas and Gatorade both replenish this and other minerals and electrolytes that we lose from sweating or strenuous work and play. (Athletes drink Gatorade for this reason.) I think it's important why you were low in potassium. Did the doctor find out why? Some blood pressure medications deplete potassium if they are diuretics, so check to see if any of your medications are doing that. Low potassium and salts can cause heart irregularities. It's easy to get your levels up again.
Eating a lot of bananas will elevate your blood sugar, so be careful and be sure to check that. Having low potassium is just a condition that is easy to fix when you replenish it with bananas and Gatorade but I think it's very important to find out why you were low in potassium to begin with. Good luck.