One of my tortoises has had a respiratory infection for almost a year now , i was going to the vets for almost 6 months and there was no improvement. He is anorexic and refuses to eat , sometimes he has a bite out of something and then leaves it. a few months ago he improved by eating on his own ( half a leaf) so i have to hand feed him some Oxbow critical care powdered food through a syringe, which i got from the vets. I live in Scotland so i can rarely have him out due to the weather and the state he is in, on sunny days when i put him out in his run all day and he seems very lively. He doesn't want to bask or anything. It's a shame because when i put him in the run he tries to get to my other tortoise but obviously i can't have them together. really would appreciate some advice on how to speed up/help him through this, even some medication details , i have tried Betamox drops and also another weaker clear liquid what i've forgotten the name.