Welcome to the forum
@ShellyM1969 Sorry to hear about his struggles. Getting contact with a diabetic nurse is important for you right now, can you contact your local hospital and go direct through them if your GP isn't helping ?
I would view two separate issues here, both his type 1 management and his depression, so finding a contact at the hospital to help with the type 1 and going back to your GP about his depression, if your GP is not forth coming with help then make a complaint to the Practice Manager about this.
Sadly type 1 can really get you down, talking about it will help, but in a non confrontational and friendly way, is there anyway you can direct him to come here ? Maybe chatting to strangers with type 1 might help him off load a bit. Exercise also helps with depression so getting out for a walk, fresh air, do you have some good parks locally ? We all get burnout at times, it's finding what works best for him, whether it's talking, exercise, medication or counselling, it's a temporary phase but it does take some effort to lift out of the dark clouds, best wishes