When I was in the middle of replenishing my iodine, I absolutely craved it, and my body did not like it when I tried to reduce. It was as though it had pathways open and ready to respond and I was trying to take away the product it needed. I went with the craving. With an iodine loading of only 40, I wouldn't try to reduce how much I take.
Some seafood can have high levels of histamine that your body responds to. Histamine caused the problem from the shrimp. Not the same as having an allergy to seafood.