Let's start with the obvious...
How much is he eating, what food, what times? Water access? How much water is he drinking during the day? Is his crate somewhere hot? Is he overheating at night? Does he have access to water at night? Is he used to sleeping in the crate? Have you tried sleeping in an xpen or babygated in a small space? Could it be anxiety over being in the crate?
of course we have stated the obvious, again im a vet tech so Obvious is what i do best. This is something very unusual something the drs arent use to. Doing his blood work at first we thought it was his liver due to him eatting acorns..which are highly toxic by the way... but after more in depth research his liver came out fine as well as xrays. As the answers to your questions to just keep everyone on the right track...
~He is eatting 1 wet can two times a day of puppy large breed he just hit the 21lb mark. which this is ideal for his weight. i know i am suppose to feed him 3-4 times a day but that cant happen...
~He started out drinking tons of water, we found out that it was him just having his puppy moments now he is back to normal drinking habits through out the day.
~His crate is not somewhere hot, actually our house is kept pretty cold, which is right beside our bed ware he can hear and see us.
~No he does not get water at night yet because he spills it every time and would pee in his crate and lay in it, he didnt care. We are finally getting the peeing in the crate under control so we are going to try water again soon.
~thought about anxiety in the crate, however he goes in there on his own throughout the day and sleeps in it, so he seems pretty comfortable in it to me, although sometimes i wonder.
~Also yes he has been dewormed 3 different times.