Help me, please! This is a serious emergency relating to my beardie!

[kmdb]

I need help very badly. I have had my bearded dragon for about 10 years now and for the past few months my dragon has become completely lethargic. It first started when he was refusing to eat on his own (I spoon fed him almost every time I fed him). It got to where he would not eat vegetables or fruit. He would eat mealworms but only sometimes. I tried not to give him crickets too much because I knew his veggies were important (but he still did not want them). I'm pretty sure he went though a time of brumation but it started around summer time instead or fall or winter. He looked weak and tired a lot during this time. Just a few days ago, I fed him some crickets (with calcium powder) and he moved around like normal, chasing them for exercise because I give him live ones. So I got hopeful that my dragon would soon return to normal and tried to give him some greens (kale and spinach leaves in small pieces) and a few mealworms. He is not moving at all, very cold and his beard is extremely black. He is kind of pale for what color he normally is and parts of him look sunken in. He won't blink or open his mouth. I read somewhere that Pedialyte (the childs drinks and things) could help, by warming it and pouring some on a dragons body, their body is supposed to absorb the nutrients. I have no idea if that is true or not but I did give it a try and I had some response from my dragon, mainly just a few twitches here and there. But He did raise the tip of his tail and move it slightly for a good 15 seconds, probably. Right now he is sitting next to me and there is a heater in from of him because he was so cold. His environment: Sand for bedding, he has a bowl for food and a rock to bask on (also he can get under it for naps). The lighting is a single bulb, supposedly fit for a single beardie to keep warm and to bask in. I've never put a thermometer is his tank (I know that's bad but i've had him for 10 years and he has been fine up until this point). Is there anything I can do? Is he just old? I am so lost and feel like I am out of options. It is 2am and tomorrow is Sunday so I don't have access to a vet asap.