Thank you for your help and guidance. I’d be nowhere without this forum I’m so gratefulYou could call the receptionist at the Animal Hospital and tell him/her of your concern for the tortoise's well-being and ask if the doctor has any emergency time today or tomorrow when the tortoise might be seen. If they say no, then ask them to please call you if anyone cancels an appointment for later today, tomorrow or Wednesday earlier than 3 PM. Also tell them hoe long it will take you to get there.
I am a dentist and deal with emergency patients in my schedule very frequently, so am letting you know the things to ask and say which may help you get seen sooner.