It will make your adrenal fatigue worse, it wears you down while it fixes your body. I crashed for months because my adrenals weren't strong enough when Iodine stimulated me. Hard lesson to learn, have to do homework here.
A healing crisis makes you feel a lot worse, before you feel better.
You said it made you feel better one day then crashed, so that is textbook or classic signs that your adrenals can't handle it and is exhausted.
You might start at the adrenal fatigue forum then come back to the Iodine forum, and slowly work your way up from small doses of Iodine such as 12.5mg or even much less than that, if you're one of the few who are extra sensitive.