Oh god it's such a long story/ordeal which I've bored everyone with, but he basically decided he hated sleeping on his own overnight all of a sudden about 4 weeks ago. He's always slept soundly in his crate downstairs since he was tiny, so it really was a complete 360 overnight.
The ligament damage is sort of historical as he did it back in October and has just had an intermittent limp since then, and the physio doesn't think he is actively in a lot of pain so I've kind of ruled that out, since the sleep thing is pretty recent. So we've looked at everything and don't think the two are linked.
We have tried every combination we can think of - sleeping outside of the crate downstairs, sleeping in our bed, sleeping in the crate in our bedroom, sleeping in his plastic bed in our bedroom, having background noise on etc etc. The only way he will sleep is if someone sleeps on the sofa downstairs with him. Weirdly, I can put him in his crate in the daytime and close the door, and he will grumble for a few minutes then go to sleep. It's just the evening which triggers him. He's also fine in the daytime if I pop out and he will just snooze on the sofa.
We had a couple of nights success of him sleeping in our bedroom after spending a few nights of hell trying to get him to settle in there as he's usually not allowed upstairs so it was just TOO EXCITING, but then all of a sudden he started getting stressed out and was constantly pacing around and obsessively humping everything, then he did this awful possessive snarl and tried to bite DH when he was trying to calm him down. So now we are back to sleeping downstairs with him.
We are in a mid-terrace with neighbours either side so when he's barking and howling at night it's a nightmare, and dd is autistic and gets really stressed as it wakes her up.
I think I've covered everything there but we are pretty stuck with what to do really. I've spoken to our trainer about it and she thinks it's likely something as simple as a noise has spooked him once at night, or he needed the toilet and panicked, and now he doesn't want to sleep alone.
Honestly it is driving me mad. I wouldn't usually want to do this because I think in proper anxiety cases it makes things worse, but I am at the point where I'd happily let him 'cry it out' because what else is there left to try... but we can't because neighbours/dd. I've tried leaving him for a while before but once he starts howling constantly at around the 30 minute mark I had to give in 😵💫
Sorry that was so long but I like to be thorough haha!