I nearly passed out after donating blood because I was dehydrated. My ears started to ring, my vision got blurry/delayed/streaky like I was drunk, my muscles got delayed and less coordinated, and my face felt hot. Sorta felt nauseous. Leaning back with a cold towel on my forehead and a big drink of water and sugar/salt helped. It was definitely disturbing and I was glad to have nurses handy to help me get comfortable and get my blood pressure up again.
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