Will this go away?

So I'm taking new medication for anxiety it's Hydroxzine. It's for anxiety, also an antihistamine. I took it today and passed out for basically the whole day. Will this go away with time? Is it because I'm getting used to the medication? It's late at night and I can't call the doctor. I'm gonna call Monday, I'm just wondering if any of you experienced this while taking it?
Will this go away?
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