This is what I've done when confronted by similar symptomology..
STOP the Iodine for 2-3 days while continuing to flush your body out with ABUNDANT FRESH juices (fruit/veg). If using water as a flushing agent, spike it with something like lemon, lime, etc.
BREATHE DEEPLY! Fresh air oxygenation is KEY to removing toxic gases that accumulate in the body from detox. These toxic gases from releasing toxins were the primary culprits exacerbating & exerting nerve pressure which resulted in much pain.
After doing a liver flush, nearly ALL of the irritating symptoms - i.e., headaches, breakouts, sleeplessness, - abated.
I now use between 50-100mg. of Lugols daily - WITH FOOD - and am doing just fine with just a few symptoms such as liver tenderness. Taking it with food has made a huge difference for me.