I am sorry to hear about Robbie, and I am worried.
My name is Rebecca. I am a veterinarian, and will do my best to help.
That heart rate is very concerning. Are there any veterinarians open near you today?
If you look at his gums, do they look a normal bright pink, or do they seem pale?
The trembling and panting could indicate pain, or stress, or fever. Is there any way for you to take his rectal temperature?
I sure wish I could examine him: feel his pulses, listen to his heart and lungs, take his temperature. A good physical exam is the first step to figuring out what is wrong, and how best to treat him.
At least you can keep him drinking, and hydrated. As long as he keeps it down, keep offering small amounts of water, or broth.
The high heart rate is really concerning. This could be a heart problem, or he could be bleeding internally.
I am not seeing responses from you. I hope you can see what I am writing!
I will try to connect with you another way, if I do not hear from you soon.
We took Robby to the emergency vets and they have given him two injections, one for his pain and one for his fever. We need to take him to our own vets tomorrow for an abdonimal scan.