How scary and awful! I'm glad that Cali's eye is ok. And luckily, you didn't get hurt.
Is it possible that Diego threw up or spit out his Fluoxetine secretly? And I mean for several days. Missing one dose should not make him act like that. If that is even a remote possibility, Diego could suffer from withdrawal symptoms.
You should definitely talk to your vet.
How is Diego acting now? Are they separated?
Again, I'm glad to hear that you and Cali are ok. Best wishes!