DS is 10 months. A couple of weeks ago, we finally decided it was warm enough to move him from our bedroom to his own (radiator in there doesn't work and HA are being slow about sending someone out to look at it), and since we moved him he won't sleep in his cot.
We've tried all sorts - me putting him down, DP putting him down, putting him down asleep, putting him down awake, and this whole week I've been sleeping on the floor in his room in case that helps him settle. But no, as soon as there's a slight noise/temperature change/light change, he wakes up, and is then instantly climbing the bars of the cot and screaming. And I mean screaming, like someone's trying to murder him 
Every night I've had to have him sleep with me, because I'm so knackered I can't deal with the hassle of the screaming, and DP won't be available for bedtimes/nighttimes for ages. As soon as I/DP pick him up, he's fine and happy, and if I lie him down next to me he'll be asleep almost immediately, albeit very fussy and whingey, and constantly crawling around (another reason for move from bed to floor - he can't fall off the floor!)
I reckon it might be a combination of separation anxiety, learning to walk (he's just started standing independantly and trying to take steps - big milestone, so big sleep disruption?), the fact that his beloved Daddy is away most of the time atm 
(whole other thread) and the change of scenery. All a bit too much maybe.
Is there a solution? DP says I should just leave him to cry, but I can't, it tears holes in me to hear him screaming until he literally chokes. [softie emoticon]
Am I going to have to bite the bullet here? I really don't want to but I'm exhausted and can't keep going like this much longer.