Hi, I Am 5'10" And Weigh 190. I Have No

hi, I am 5'10" and weigh 190. I have no medical issues that I know of. I was wondering if the nauseous feeling I get after eating shrimp is an allergic reaction? I remember the first time I ate shrimp. I threw up about 2 minutes later and was fine immediately after. I tried it again just the other day and got really nauseous immediately after eating it. Psychosomatic perhaps?