Apollo Needs Critical Help

I'm so sorry to ask for help, I know everyone has their own struggles but tonight Apollo, my 8 year old VERY LOVED chihuahua , got into a scuffle with my room mates dog over dinner . Though quick Apollo is so small he immediately went into shock and stopped breathing. He became paralyzed and started to turn blue. I arrived home at this moment. I've never felt more despair or fear. He turned pink again with dog cpr and my hysterical but he was unresponsive and paralyzed and barley breathing. His temperature dropped and we kept preforming cpr to the vet luckily still open by 15 minutes down the road. THe doctor gave him oxygen and a shot of dex and examined him. He is in shock and she gave us antibiotics and X-rays. Nothing internal she could see was wrong but he remained unresponsive and his temp is low and he wa still struggling. She stabilized him as much as she could and sent us to VETS he emergency hospital . We paid $361.79 at the first place. He is now at VETS and she isn't sure what's going to happen. I'm terrified and heart broken and need him to be okay. If you even remotely know me you know that my pets are my life. I'm writing this because with the estimate or the first night is $723.50 at this place and he may need to see a specialist or a neurologist . I'm sick and worried and panicked and I hate that I don't have the money to pay for this. I'm doing the best I can but I don't make much and I pay rent and bills and am really struggling. I will do anything he needs because I need him to be okay but if you have any spare change I would greatly appreciate it . I can't afford this but I will come up with anything I can to help him. Please if you can help I would be in your debt. He's sassy and adorable and my oldest and I love him so much and I need him to be okay. Please send prayers. Thank you for anything . I'm writing this thru tears so please excuse the typos Hb