hi, I have had dizzy spells with numbness in my hand and lips and mouth with some feeling of confusion,like I knew what I was thinking but it didn t come out right when I said them, over the past 2 yrs,about once every three months,im not sure what cuses this I have been to the e,r the two times before last and they did several test and the only thing they found is very low potassium levels any clue as to what this could be?