I don't even closely hold myself to be an expert in your situation, however I thought since your in a hurry, I'd respond.
This could be a strong detox reaction. If it is, doing a salt flush may help. This involves drinking water mixed with quality, unrefined salt. Sea Salt
is a popular choice. If your still nauseous you may want to sip that water.
Also, DON'T TAKE ANY MORE Iodine
UNTIL THINGS SETTLE DOWN.
My best guess is that you shouldn't panic. After cannabis, iodine/iodide seems to have the widest safely margin I've found for any substance (except water).
When your stomach settles down, you might want to try some vitamin C.