How I see it is that the dose of Iodine taken is very low, compared to what most do at this forum forum. Even my cat get one mg or two a day :)
The symptoms listed is very likely a magnesium deficiency, maybe brought forth of the little prolamine (not familiar with this iodine, I would switch to Lugols or SSKI )
" last night I went from feeling just fine to having severe shaking/chills and a fever around 100-102 and difficulty breathing with chest tightness and severe neck and shoulder tightness and pain throughout my spine. Needless to say, I was completely freaked out and ended up in the ER last night. The chest tightness and difficulty breathing is what really sent me over the edge."