Have you ever developed a sudden allergy?

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Yesterday I discovered I might be allergic or intolerant to nuts. I have barely eaten nuts in my entire life but yesterday I ate a LOT of nuts 3 times and a couple of minutes later puked it. I don't think it was bad digestion because I ate 2 huge bowls of rice with meat, vegetables and beans and they didn't make me puke but the nuts did in just a matter of minutes. I'm not sure if it's allergy but it sure feels like it. Has this happened to you?