He is better now. I am not sure what happened. Just in a few days he went back to normal shape and weight. I took in some poop and she didn't see anything wrong with it. But he's good now, eating proper and he has stopped soaking all night. He sleeps either under a leaf or on the glass, not on the substrate floor. His stomach stopped looking sunken in and weird about 2 nights ago.
sorry for the late response, have been busy with midterms/term papers :P