First thing you need to do is give yourself a break! As Suse said, this is just a phase and it will pass. It has nothing to do with your parenting, every family goes through a stage like this. right now I'm typing one handed as I'm nursing our 18mth old who has woken up 6-7 times since I put her down at 8pm!

DD is a shocking sleeper and we had her at the dr due to her freq night wakingings at 6mths and were told to sedate her (which we obviously didn't - despite probably wanting to) We go to a chiropractor regularly which helps her settle and we are now doing the elimination diet (book by Sue dengate try fed up dot com) We had a bad weekend and beginning week and fell off the diet wagon which is why I'm paying for the consequences tonight but other than that it has been a godsend.

Have you changed anything recently, washing liquid, food, nap times, routines, switched brands of anything? I remember my DS was unsettled for weeks and we tracked it down to changing washing powder??? Who knows it might be a developmental milestone or it might be that she is trying to change her sleep routine dropping naps or changing bedtimes???

Have you read the book by Elizabeth pantly (The No Cry Sleep Solution), it's great! I'm looking forward to getting the toddler edition from the lib when it's available, it's full of gentle settling ideas.

All the best and remember when you are waking the halls in the middle of the night there's a hole bunch of us out there doing exactly the same thing!