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My name is***** I am very sorry to hear that Gizmo is sick. I would be very concerned that Gizmo has a fever after his adventures the past two days. Fevers can be caused by infections such as abscesses, pneumonia, pain, injury, or even cancer. I would strongly recommend that you take Gizmo to your regular veterinarian first thing tomorrow morning if they are open or to the local animal emergency room tonight or tomorrow morning. They will likely recommend blood work and x-rays to determine the cause of Gizmo's illness and then recommend treatments such as antibiotics, pain medication, fluids, hospitalization, etc.
Good luck to you and Gizmo!
I hope this answer helps you. Feel free to contact me if you have any further questions.
Kansas State University
College of Veterinary Medicine Class of 2001