Hi Sarah - I am in the same situation, and currently looking for more answers. All I know is this is a time of very big change for the lo's. Teething, crawling, standing, colds, and more. My dd too has never slept through the night and I am about over it! We get one night here and there.
So {Hugs} for now, and I will look for answers and let you know if we come up with any solutions. Right now, all I try to do is get dd through at least 8 hours with no food. (she'll wake 2-3 times in that period). She was sick, so I am starting from the beginning, but hopefully she'll get the message soon.
Beata