Hello and welcome to JustAnswer. My name is ***** ***** I am a registered veterinary surgeon.
I am sorry to hear Terry is not recovering from hibernation as he should. Post hibernation problems in tortoises are unfortunately seen often. The primary cause of problems are incorrect reviving facilities / procedures, inadequate preparation (poor body condition/nutrition), or concurrent disease.
From what you describe, you are doing all the appropriate steps in reviving him. Often, they come out of hibernation dehydrated, so bathing and giving water is often needed.
I think a veterinary visit to rule out concurrent disease is needed here. Some things your vet can do include x-rays to look for chest infections, faecal samples to look for high worm burden, running bloodwork to check kidney values, checking for signs of cheloanian herpes virus, checking for signs for stomatitis. If Terry's health checks out okay, then he needs good nursing to get him over the hump. I do not know of any vets in France personally that have experience with reptiles but the Association of Reptile and Amphibian Veterianians has a find a vet page (http://arav.allenpress.com/arav/findavet
) and this website informs me of a veterinarian in Paris who is a specialist in reptile medicine (http://www.veterinaire-european-specialist.com/specialites/medecine-exotique.php
). A veterinarian with experience in reptiles would be the best option in this case, as post hibernation issues can be subtle and might need extensive work-up to determine the problem.