Urgent - Suspected Anxiety in rescue Husky - At our witts end

Good Morning Folks,

Please accept my apologies if this post isn't overly coherent, I've had little to no sleep so I may waffle.

My partner and myself rescued a 1 to 2 year old male Husky about 3 years ago now. When we first got him he was a bit of a handful but I wasn't deterred as I've always had dogs, my father has 3 huskies and I have a 3/4 Husky 1/4 German Shepard mix whom I've had since I was 17 (I'm 28 now!).

He initially had an issue with authority and was generally very clever but often ignorant (as I've found most huskies to be), however he's done amazingly over the years and has turned into a very calm and obedient young man....

Until recently.... and I'm not entirely sure what the cause was / is as nothing has changed of late as far as I can tell but something has completely changed him.

Both dogs 4 year old Husky male (Kale - the problematic one) and 11 year old Husky cross female (Tehya - good o'l girl) sleep in our bedroom. We have two big dog pillows one to the side of the bed and one at the foot of the bed.

Kale goes into a crate during the day but is only in this when we're out of the house.

Now when it comes to bed time the usual scenario is out for wee wee's and then up to bed. Recently Kale hasn't settled when going up to bed and he will lay on his pillow until me and my partner are ready to sleep. Then once we're laid there trying to sleep he'll start pacing.. walking the length of the bed eventually sitting at the bottom side panting heavily, really heavily.

Any attempt to get him to lay down results in him hanging his head and putting his ears down like he's been told off despite us using a normal and even a babying tone.

He will then lay down until we close our eyes then he's at it again. If we ask him what he wants and open the bedroom door he runs downstairs as if he wants to go bathroom - however he just stands outside and sniffs and then comes back inside but acts like he's in trouble when we say back to bed and attempt to get him upstairs.

I'll be honest, we've tried babying him and fussing him letting him know its ok, we've tried telling him off etc. nothing is working.

We believe this to be separation anxiety however he sleeps in the same room as us so I'm not sure what to try...

It's getting very hard to keep our cool and understanding when we're on our third / fourth night at 4am and he's pacing around and I know it's having the opposite desired effect so I'm coming here to ask for help.

Any suggestions or recommendations are going to be greatly appreciated, I know this isn't going to be an instant fix and fully understand that this situation needs patience and understanding.