I've done a couple of self-experiments like that. I've stopped taking ALL supplements, including iodine, for about 5 days and I was in very dire straits ( Rheumatoid Arthritis
). Before that, I tried taking my Iodoral without the supplementation for about 3 days - same symptoms as posted above: headaches, nausea, etc. I also take additional supplements as per the recommendation of my Nat. Doc. to address the RA
symptoms, and you wanna talk about taking some capsules? Twice, daily, I'm taking 14 different supplements! But, this is the positive aspect about that: I would much rather ingest natural ingredients in bucketloads than take a bucketload of chemicals (prescribed drugs) to address one symptom and counteract the exponential side effects of said drugs.
It's worth the inconvenience, I believe! Best wishes.