He looks very dull eyed. Get him to the vet immediately!!!!!(when the vet is available in the morning)
something may happen to him at home if you do not and you will regret not trying to help him.
Rabbits systems can shut down if they are not eating within 24 hours and the longer you leave it the more you are putting his life at risk.
Do not take him out in the snow. If he is ill you will make the matter worse as he will catch cold.
As i have said before. Wallpaper paste is poisonus to rabbits, and carpets are no go either to the rabbits system. They cannot diget either and it can be fatal
Make sure he is warm and hand feed water if needs be to keep his fluids up.
If you have a blender, blend some carrot up onto a pulp and syringe that into him.
Is he bloated around his tummy, if so concentrated pineapple juice will break down any blockage as there are enzymes in it.
Good luck with the vets.