Hi Anna,
I have a non sleeper too1
She is 17 months old, I really don't think she has ever properly slept through.
Similar to you, she goes to sleep on her own, like a dream, then wakes any number of times through the night. only difference is that she has a dummy. but she doesn't even want that most of the time.
fortunately she is quiye easy to settle back down, and she doesn't usually fully wake up.
Last night was th worst yet: DD1 has a cough so she was up a fair bit, though normally she goes 12 hrs straight. Then we went to bed at 10pm, and that was it. DD2 woke up every 20 mins or so until 1am, then we got a couple of hrs slepp, until DD1 woke up and then all up for the day at 6.30am. reckeon I might have had 4 hrs!
So, yes, i know how you feel. We have tried pretty much everuything. And it is the pits when you are sleep deprived.
I now have to think that she just isn't a good sleeper. She is a fantastic eater, very sociable etc, just doesn't sleep that well.