Fox,
Please tell me you have had your potassium checked. Or get it checked. they usually order "chemistry", and that means electrolytes and sugar. If indeed the problem is K+, then you need to be actively treated. If it is magnesium (a reason your K+ would keep dropping) then *that* needs to be addressed. Please do not continue to take potassium supplements without input that takes into consideration your current lab values! Too much potassium is lethal, as many here have pointed out.
I guess I am a worry wart...
Jess