Why did I throw up after taking Vitamin C and Zinc?

I've had a really bad cold for five days now and a bad chesty cough and my throat is so sore. I've been taking vitamin C all day and Last night I woke up and took an dissolvable vitamin C and zinc pill which was 1000mg. I also took an evening primrose oil pill and then had bad diharrea and vomited three times

Why did I vomit after taking vitamin C?
Why did I throw up after taking Vitamin C and Zinc?
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