Whenever I eat crab I vomit and have diarrhea within an hour or two of ingesting.  Ive had four incidents in the last two years.  It took a while for me to even think it may be crab as Im lactose intolerant and kept wondering what dairy did I have to cause the reaction.Ive seen an allergist and both skin and blood tests have come back negative for crab and other shellfish.  Even though the tests have come back negative should I be concerned about anaphallxis and carry an EpiPen?  Either way Im not eating crab again.
Hello. Thank you for asking at Chat Doctor. I went through your history and would like to make following suggestions to you