Hey girls, has anyone else dealt with something like this? Our little one is only 11 months old. In…

Hey girls, has anyone else dealt with something like this? Our little one is only 11 months old. In the last one and a half to two months, she's had a runny nose no less than four times. It's definitely not teething; it's a persistent runny nose with thick green mucus. Overall, during the day she sleeps fine—though she does cough a bit—but normally. The nights are a nightmare though: she throws up. She falls asleep peacefully while I'm rocking her, and there's almost no coughing at first. About thirty minutes later, she starts coughing again. Then, another half-hour passes, the coughing gets worse, and she vomits like a fountain. She won't even open her eyes, yet she keeps sleeping. This happens once or twice. After that, she sleeps through the night like a champ! What on earth is going on? Naturally, before bed I clear her nose, drop in some Nazivin, and prop up a high pillow. Zero effect.