@YorkshireFelix I can't remember how old he is, but it's really normal apparently for adolescent dogs to have a crisis in confidence. Did you say he had some pain too or am I getting confused?
I know you don't want him in the bedroom long term, but it sounds like you all desperately need some sleep. Would it be possible to come up with a plan that involves him sleeping with you in the bedroom for a few weeks and then moving the bed closer to the door and into the hallway/landing, then back downstairs?
Do you have any rugs you could put down in the short term, to stop the noise from the wooden floor? You could keep any loud toys downstairs. I sleep with brown noise playing which screens out street noise but still lets me hear Bill if there's something he really needs me for.
I know there's all kinds of problems with hair, and not wanting him up there, but from everything you say, he really desperately wants to be with all of you right now and is struggling. He probably won't be struggling forever.
I'm saying this having had a wonderful walk with @brushingboots today bookmarked by two frankly horrendous car journeys. He is just not coping. Like you and sleeping, I know he needs to be able to do this eventually - but he doesn't need lots of long journeys right now, when he's not managing them at all, and it's just causing both of us godawful stress. For the moment, I'm going to go back to 10-20 minutes in the car at a time, as we can't avoid those for daycare, and maybe one or two trips of similar length or shorter in the week. I really want to push it faster (and I'm sure you do too) to get him back to where he was at his best, but today showed me that I absolutely can't. I have to go at his pace 🙁