F***ing hate coughs!!

My kids very rarely get sick, but when they do DD always gets a cough that keeps us up at night and works its way into making her cough during the day. I HATE it. There's never anything I can do to fix it or make her feel better and it's horrible : (
I swear I've tried everything and nothing works. Nothing makes me feel worse than when my kids are sick and there's nothing i can do : (