ELI5: Why would a person get sick after being injected with MRI contrast in their IV?

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The original was posted on /r/explainlikeimfive by /u/Desperate-Bridge2207 on 2023-06-27 23:11:17+00:00.

One time in the hospital suffering from gi problems I had to drink a certain amount of liquid contrast for an MRI on my stomach , then when I was brought down to the room with the machine the nurse administered the IV dye or contrast and not even two minutes later I had to yell help because I got really sick . Am I allergic to the dye used for MRIs or was it a random occurrance? I felt instantly hot and sick . I have no known allergies could this potentially be one? Thanks in advance guys!