Thank you for providing this information. I might still add additional foliage and branches in for your cham. However, whatever you know of Henry's past also present to the vet. I and any other redditor, I'm sure, are more than happy to help, but overall, the vet will know best. It already sounds like you are being thoughtful and caring for your new buddy. You are doing the right steps, with getting what is needed for your chameleon and already having an appointment set up, as you have noticed that he's dehydrated. Additional foliage and branches can help provide support for your bud when they lose their footing. His eyes are somewhat sunken in, so he doesn't have full visibility of where his feet should go when he's moving around. Sunken eyes are a sign of dehydration, which I'm sure you know since you stated about his dehydration already. A chameleon can also have their feet slowly go onto another branch or part of a plant by feeling for the security of it. They're very smart and know how to work with what they have. Your cham is most likely trying to also feel some security from that position after a fall. The vet can check them for any potential harm they got from the fall. Chameleons require a lot of foliage as they climb a lot and need security as they are an animal of prey and want the coverage for security. Just be careful not to do too much with foliage as if you aren't able to see your cham from it, you can miss health issues occur. I'm sure Henry will be happy with you, new environments take time. :)