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I am sorry to hear you are worried about Diego. My name is Rebecca. I am a veterinarian and will do my best to help.
The first thing I would check is his gum color; his gums should be bright pink. If they look pale, he may need medical attention. Try to get him to drink, to stay hydrated. You can offer him tuna juice, chicken broth, as well as water.
Can you take his temp with a thermometer?
You can try giving him 1/4th of a 10 mg Pepcid AC (famotidine) for vomiting.
Let me know how his gums look, and any other questions you have.
How is Diego today? I hope you were able to see what I wrote. Please let me know if I can help with or answer anything else.