On 5 gram iodide, I need more selenium. I don't know if that goes for everyone on higher levels of iodide. Of course I have/had Hashimoto's and am/were hypo. Maybe it's because of that that I need more selenium on higher dosages of iodide. It could also be my mercury poisoning: more Iodide dislodges more mercury and mercury binds to selenium, making it unavailable to the rest of the body. But it might also be that higher dosages of Iodide mean you need higher dosages of selenium. Just wanted to make you aware of this.
The way I can tell that I need more selenium is that my thyroid will start to hurt if I do. It will feel warmer and it feels busy somehow: I can feel it being inflamed. Taking selenium takes the inflammation away in one hour.
So you get the "coughing up mucous" as well, so that probably is the high level of Iodide doing that, interesting.
For the zits: if you paint them with Lugols at night, they should be gone in the morning. If they are more boil-like, a teaspoon of turmeric twice a day with pepper and fat in a warm liquid (I use coconut oil for fat and almond milk) work like a charm (tip from earth clinic).
Lots of salt pushes for all the detox symptoms.
Magnesium may calm your heart.
Lots of sleep.
Your body is using up nutrients faster on this level of iodide, so plenty of good food is needed as well!