My 4 month old veiled chameleon has become so lethargic he can't even climb. He sits at the bottom of the enclosure and looks like he's suffering from some kind of paralysis; his limbs sort of flail about and he sort of scoots along. I've continued to feed him and mist his enclosure, and I haven't changed his lighting. He got like this about a month ago (but not so severe) and he eventually rebounded. He was shedding at the time, and I thought it might have had something to do with that, but he's not shedding now. It's really heart-breaking to watch him. Any advice?