First, congratulations on your new addition. I wish you many happy years together. I'm sorry it's starting with so much drama. First, you should stop panicking. A clear head makes better decisions. I expect that he is fine. He chose to hide behind your background because he likes that space better than the hides you got him. Tight spaces make them feel more secure. 30C (86F) sounds like a perfectly safe temperature for him to stay in. From what you've told me, I would probably wait him out. He'll come out when he feels safe and secure enough to explore his new environment. I'd turn off any lights in his enclosure. He'll feel safer in the dark. Be prepared for a long wait, a week or more. He was already stressed by the move. Then, a huge animal tried to rip him from his safe spot. I wouldn't try feeding him until he comes out on his own.