Yikes. *hug*. Coffee often helps clearing the sinuses, and I think you can have a little while pregnant with few worries. Or you could try something spicy like hot and sour soup.
As far as earworms go, my last big one came during late Hannukah, when the Jewel down the street (a grocery store for those who unlike Ori have not lived in IL) was playing "Light the Menorah". Gentile that I am, I'm not terribly familiar with it and don't have a quick memory for most music, but it's catchy enough. So when I leave the store, it gets garbled in my head into the far more familiar "Korobeiniki", i.e. Tetris music, which stuck in my head all the way home.
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As far as earworms go, my last big one came during late Hannukah, when the Jewel down the street (a grocery store for those who unlike Ori have not lived in IL) was playing "Light the Menorah". Gentile that I am, I'm not terribly familiar with it and don't have a quick memory for most music, but it's catchy enough. So when I leave the store, it gets garbled in my head into the far more familiar "Korobeiniki", i.e. Tetris music, which stuck in my head all the way home.