Ahhh sinus during pregnancy memang teruk, lah! A few of my mum friends had this issue, one of them said nasal saline spray really helped, and jangan take strong medication without checking with the doctor first sebab pregnancy kan kena careful. Try stay hydrated, use a humidifier, and elevate your head when you sleep, honestly helped my friend a lot with the congestion. Tapi kalau dah tak tahan sangat, best to check with your gynae or GP, they can suggest what's safe for you and baby.