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Pickled fish incident
According to what you said, it is most likely nitrite poisoning.

1. The restaurant used it maliciously, and it may be used to pickle fish in small doses.

2. The sauerkraut used contains nitrite. Fresh vegetables, rotten vegetables and cooked vegetables stored for a long time, at this time, the nitrate in the original vegetables is transformed into nitrite under the action of nitrate reducing bacteria;

Fresh pickled vegetables (sauerkraut) contain a lot of nitrite, which generally disappears after 20 days of pickling.

Nitrite poisoning generally causes headache, dizziness, fatigue, chest tightness, shortness of breath, palpitation, nausea, vomiting and cyanosis of lips, nails, skin and mucosa. Some skin and mucous membranes of the whole body are blue and purple to varying degrees. In severe cases, there are fidgety, listlessness, unresponsiveness, loss of consciousness, convulsions, coma, respiratory failure and even death.

① Mistaking nitrite as salt causes poisoning; ② Use "industrial salt" as table salt. The incident of nitrite poisoning in Beijing on August 26th was caused by merchants making fast food with "industrial salt". Eating pickled meat products, pickles and spoiled vegetables with high nitrate and nitrite content can cause poisoning. In the past, the black mouth disease caused by replacing food with vegetables in poor areas was a typical food-borne nitrite poisoning; ④ Drinking bitter well water and boiler water with high nitrate or nitrite content can also cause poisoning. ⑤ Excessive use of nitrite in meat processing will lead to poisoning.

In short, for the sake of health, we can't eat there again. You can make your own food if you like. Very clean.