Looking for anons who have a history of food allergies and/or

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Looking for anons who have a history of food allergies and/or intolerances.

For about 5 or so months now, I am completely unable to eat fish of any kind. Salmon, catfish, tilapia, shrimp, sushi, etc. Last time I tried to, I ate one single small bite of fried tilapia, and 5 hours later my stomach was on fire and I was vomiting so violently, the muscles in my throat are still sore. This happens basically every time I eat fish. Even the smell of cooking fish or the mere thought of it makes me nauseous.

This can't be an allergy, right? Because symptoms of an allergy take affect almost immediately, don't they? With me, it happens hours later. So what the fuck is it? It really kills me because I loved eating fish my whole life up until the first incident of getting sick 5 months ago. I'm 26 and it's surprising to me that I'd develop an intolerance at this age.

Will I ever be able to eat fish again?