I have GERD

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So apparently I have GERD. I have about 3 weeks to go and have just been miserable. Bed time is the worst when I'm laying down and constantly having to swallow to keep acid down. I have to sleep sitting up practically. I'm super nervous this nausea will make me throw up during labor. I'm also nervous it's going to damage my esophagus. What is your experience with GERD?