you've just got to persevere I'm afraid.
I think trying the crate in another room is worth a try, as I said, Bella was definately more settled in the lounge and Penny found this too so maybe your lounge is worth a try?
If you know he's had a drink and been to the loo then you'll just have to ignore the crying, shut the doors and put some ear plugs in!
Only other thing you haven't mentioned is does he have a cuddly toy? Bella has a cuddly fluffy dog and she loves him! She rests her head on top of his body when she goes to sleep
She also loves to be snuggled into blankets - we have vet bed in the bottom of the crate but she has fleece blankets on the top in one half as she loves to snuggle into those, she also had a snugglesafe warmer to start with (she doesn't now) - these stay warm for up to 12 hours rather than a hot water bottle that will just last an hour or so.
What about a radio? tv? something with sound to make the room feel more 'lived in'?
Rather than a full light have you got a dim lamp/dimmer switch? I find Bella is
less likely to settle with a full light so I dim our light in the evenings so she settles.
I know it's hard when you're not sleeping and problems seem even more exagerated than normal but stick in there, you will get there in the end