you are using the KI as a potassium supplement. go to bulksupplements.com and buy some pure potassium chloride. take four grams of that a day and you wont need so much KI.
do your research. sodium and potassium levels must be balanced. pro hint: you are probably deficient in both sodium and potassium.
as for the iodide - it covers a mutlitude of sins and is excreted quite rapidly.