I'm a semi-regular poster on MN, and some people do know me in RL, so I've NC for this. I don't want to go into huge amounts of background info, but it'll probably help...
3 kids, 2 bedrooms, both DDs are in with us in a bunk cot, DS (10) has a room to himself to avoid behavioural issues which worsened when he was sharing with DD1.
DD1, nearly 3, is lovely. She's always slept well, no matter where she is.
DD2. Shoot me now. She is 11mo, and I can count on one hand how many times she has slept through the night ever. I am at my wits end, as I'm trying to wean her off me, but it's not going well. She doesn't sleep a lot in the day - how the fuck does she do it?! I thought DS was hard work, but at least he slept through the night once I got him out (that was hard work in itself).
Last night was the cherry on the cake. DH conked out on the sofa, so I left him to it, and went to bed at about 11.
Usually (ha!) DD2 wakes on average every 3 hours or so, after her initial 'big sleep'... she goes down between 7-7.30, and then wakes around an hour after I go to bed. I don't know how she fucking does it. It doesn't matter what time I go to bed. Even if I sleep on the bloody sofa. I can almost set my clock by her...
After that first wake-up, she'll then be awake at least twice, usually about 3ish and then 5ish.
The first wake up, I refuse to feed her - we've gotten that one sussed just about. But then comes the 3am session. For the sake of my sanity, I have been giving her a quick feed. Then by 5am, she's in bed with me and feeding on and off until 6ish, when she pings awake and clambers all over me and DH.
I know it's hot and sticky; she sleeps in nothing but a nappy. We have a ceiling fan going, as well as a window open, to try and keep the room as cool and well-ventilated as possible.
But honestly, last night has tipped me over the edge. She was awake pretty much every fucking hour.
I have low level PND still (although it's probably been going on for so fucking long that it's settling in to be a regular feature in my life now), and I'm trying to wean myself off my tablets, as I don't want to be reliant on them (most days I'm fine, it's just the odd day/morning that catches me off guard)
Anyhoo, so I know most some of this ranting/self-pity is down to that.
I tried to talk to the HV about my concerns with her sleep pattern, and the fact that I fight to get her to take cow's milk at all (by this age, DD1 had milk on her cereal, and another cup in the day at least). DD2 drinks it under duress. All I got told was to up her milk intake in the day, stop feeding her at night, and load up her food with dairy. 
so... how does that help her sleep? Or help stop me wanting to strangle her when she's awake at 3am screeching to be attended to?
If it were up to me, I'd just leave her to squall it out, but I'm damned if I do, damned if I don't by DH. He's supportive in the day, but fucking hell, nights are awful.
He's in management (yes, I know this isn't an excuse, but fuck, it's good enough for him), so he demands a full as possible night's sleep. What about me?! When am I supposed to fucking sleep?!
Fuck it, I'm crying now.
I have been awake since 5. I tried to leave her in the bedroom and go and sleep on the sofa, but she just screamed harder when I left the room. So, after 10-15 mins, I stomped back, grabbed her, then plonked myself on the sofa and fed her in the hopes that she'd knock out. Fat fucking chance.
DH surfaced enough to tell me off, not to be "so aggressive with her". I'm not fucking aggressive. I'm firm!
He fucked off to bed half an hour ago, and I'm sat here with a baby who's grizzling again cos she's fucking tired.
Please... someone give me some pointers to save my sanity?! (apart from LTB... although it is becoming very appealing :o )