Oh purple, I know how you feel and I'm only 5 months in to the disturbed nights! That sucks you don't get responses anymore when you post separate threads. If anything it's worse as they get older as you see more and more younger babies around start to sleep through and wonder what's wrong with yours!
The baby groups I go to all have babies that are similar ages to DD and they either sleep through or one mum complained the other day they had a bad night - their DD woke up once!!! Another pulls faces every time we talk about one 4 mo that sleeps through, turns out hers sleeps 9-5!!! It is hard not to feel resentful.
We get the constant "how's the sleep going?" Followed by advice such as "cut down her day naps", "give her water instead of milk" or "just let her cry, she'll settle eventually"!!
You are not a failure. Every baby is different and it's no reflection on your parenting how well she sleeps - it's the luck of the draw!
GP checked DD over and it's just a case of waiting it out which is what I thought. We ended up almost missing her bedtime because only managed to get the last slot of the day and it ran over by 30 mins, then we had to stop by the pharmacy. She was in full melt down mode by the time we got home!
Better night than the night before though as she actually went down in her cot, thank god! Wake ups at 11, 2 and 4, with dummy inserts in between and cuddles from 5 - amazing! We did dose her up on Nurofen and calpol though so that probably helped. Feel bad giving her medicine but I'd rather that than she suffer and the doctor recommended it.