Hi. We have a 16 week old springer puppy. He's been fab overall but is still hard work so I so understand. He is also only allowed in the kitchen at the minute, although it is a large one with a family area, settee etc so not too restrictive I guess. I used to get frustrated but try to see the positive if you can. For us, less telly and all together at night playing with the puppy. He can earn his freedom as he gets older.
Our puppy got the toilet training within a week but the crate was a massive factor here I think. Do you not use one at all? Ours is pretty large as we have a friends so there's room for a bed and a bit extra, water bowl and few toys. He gets left for about 3 hours max two or three times a week while I work but he goes there by himself to sleep during the day anyway and if I pop out or go upstairs to do serious cleaning I will close it. I always make sure we gave had a nice long walk, play, training, toilet and food so I know he doesn't want of need anything.
Can't say I love the mud and do struggle with it sometimes as it feels like I am always mopping the bloody floor, no answers other than we have trained him to sit and wait at the door and keeping a stash of towels in the utility. When he's older he's getting hosed outside!
Being tired makes it difficult to have perspective. Do you pop him out for a wee in the night then back in without fuss? Again the crate might help here?
We also prepared carefully and I live him to bits but nothing can really prepare you for the reality.
Try some training and playing to bond. Also when they can walk properly it gets easier. We have two good walks a day over the fields and local woods. I meet friends or just bump into people and it helps lots.
Good luck hang in there!!!