Hello! My experience is similar to yours, I'm also 30 and started with a low dose of Iodine and experienced similar detox: rashes, bloating, brain fog, and bromide breakouts. But I actually don't think I was more toxic than usual because those symptoms went away after only 2 or 3 months. A lot of people on here talk about how it can take years. So I don't think that your symptoms necessarily mean you're super toxic. Your body is still getting used to it.
What I did was lower my Iodine for a week or so. Then after that week after my symptoms had been better for a few days, I started slowly adding more Iodine again. It seemed to work for me - the rash, brain fog, and bloating went away and never came back. I did get bromide zits for a few more months. I still can get those on rare occasions if I forget to take my salt/co supplements for a few days.
I agree with High on Water, fluoridated water will mess with your efforts. I just buy distilled water at the store while I save up for a reverse osmosis filter. They can be installed under your kitchen sink and can cost around $200 but I've seen them for as low as $100. There are also tabletop distillers that cost around $200.