Nausea returned at 18 weeks

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I’m currently 18+5 and I barely had any nausea in the first trimester. Now all of a sudden the past week or so I’ve been nauseous almost all day, usually within an hour of eating. It doesn’t matter what I eat/how much I eat or what I do, it doesn’t go away for more than a few minutes. I’ve been taking vitamin B6 and drinking ginger ale but it hasn’t really helped. Has anyone had something similar to this happen and found something that helped?!