When your kidneys are overloaded (clogged) you may get any of the following:
water retention, pain above the waist in the back, puffy face and eyes, feeling really crumby or flu-like.
Your kidneys can't detox fast enough and they kind of back up. There's a blood test for this. But given you can slow down detox clogging by just stopping the Iodine and salt loading, that's probably the easiest step. Juices with it may help too.