Two weeks ago, I had sushi lunch with my wife's parent on Mother's day in Asakusa. A restaurant at we enjoyed sushi has a long history and is very famous as well as authentic sushi in Asakusa in Tokyo. There are several courses for lunch and we chose $70 course. That's expensive actually, but that was ok because this was kind of once in a year experience. Sushi was so tasty and it is worth the price, and I totally enjoyed sushi. The problem happened about one hour later when I was on a train to Yurakucho to buy seasoners. I suddenly felt throwing up and stomachache lightly. I was lucky because it was almost close to the destination station, and I could get off the train soon when I felt so. At first I thought that it was due to cool temperature in the train because my stomach has intolerance to cool temperature, which sometimes happens to me, and I hoped that it improved soon after getting out of the train. This feeling became stronger even thought I was walking outside in a sunny day. So I realized that something was wrong and unusual, and I tried to find a bench and took a rest. It took around two hours to recover from it completely. I was wondering what was wrong and suspected raw shellfish sushi which I usually don't eat because I just don't like it. I, however, ate it reluctantly because that was a part of the course. I had not been sure about that until yesterday.
Yesterday, I ate vongole bianco for lunch at home, which is basically clam pasta with garlic. I like the pasta and I sometimes enjoy it. Furthermore, I like clam miso soup and clam chowder. So I did not have an allergy to clam. After lunch, I headed for Tokyo to enjoy new beer which became available as of yesterday. When I got on a train, I again felt that something was wrong in my stomach lightly and it became stronger when I got to Tokyo station. It was just one hour later after the lunch. I felt throwing up and suffered from stomachache and diarrhea, which I didn't have any clue for that. I didn't think properly at that time, but my wife pointed out that this must be due to clam because my symptom was similar to that of two weeks ago. It might be true, but I couldn't believe and did not want to admit that because I like to eat clam and have eaten clam a lot so far. I checked if someone have experience like this while sitting on a bench on the station to take a rest, and I found that many people suffer from the similar symptom and figured out that it is not unusual to develop an allergy to shellfish after turning adult. Rather, it is usual to become intolerance to some foods at adult age. I might be able to rule out food poisoning because my wife ate same one.
So .... I don't want to make a conclusion, but I seem to have the allergy to shellfish now even though I did not have it so far. What I want to know is if a matter is an amount or if even small amount matters. Anyway, I should avoid shellfish as much as possible from now unfortunately.
