<... is the problem with bromides etc.... or is the problem that an increase in Iodine revs up the metabolism which in turn puts more stress on the adrenals?>
Just from my recent experience, I would say not because my metabolism is revving, I'm still waiting for a consistent 98.6 temp, or just to be in the mid 90's. And my bromine/mercury events always come with physical signs, which don't need repeating.
In a nutshell: clear urine - clear sailing!
cloudy urine - hit the decks!