From about a couple of months ago, dd2 (bottlefed by then) had a feed at about 11pm, went to sleep, then woke once or twice for a feed (settled back to sleep quickly) and was up properly by 7 or 8 am, not necessarily hungry straight away. For the last few weeks, she's gone to sleep at around 9:30pm (on a bottle), slept for about three hours(not brilliant but not too bad) before waking up, then woken up 4-6 times before waking up properly at around 6:30 or 7ish. The night just gone, she was asleep by 9:30(had about 2 ounces only), cried at 1am, drank 2 ounces, cried at 3:30ish, drank 3 ounces, cried at 4:40ish, I gave her some water and rocked and cuddled her back to sleep, cried at 5:30, drank about 4 ounces. Didn't go back to to sleep (this was unusually early for her to wake up properly) and is still awake now :(
When she wakes up, I don't put on any lights and don't normally say anything to her at all. I don't change her nappy unless it's brimming or she's done a poo (so only rarely). When she wakes, I'm never sure if she's hungry, has just got wind, her teeth are bugging her or she entered a light sleep phase, woke up and just can't self settle! I can hardly ever get her to bring up wind after a feed during the night, no matter how hard or long I try, even though she brings it up fairly easily during the day
So I can't do controlled crying with her, since she does occasionally burp when she cries and I pick her up. I just don't know what to try to change her sleeping pattern, apart from giving her water instead of milk when she's had a feed within the last couple of hours. I wouldn't mind if she still needed two feeds between 10pm and 6ish, but waking up with only half to 2.5hours in between (after her initial 3-4 hour stint) seems rather excessive to me for her age 
Can anyone relate to this and give advice? I'm shattered...