Um..."dysphoria" isn't severe anxiety. It's literally "bad mood", the opposite of euphoria. All system depressants, which include Vicodin, can potentially make you a bit depressed.
With that in mind, you're not hallucinating. I used to live with someone who had magic cats. They managed to seal themselves into drawers, escape through non-existent holes in the house, and basically vanish and reappear with great aplomb. I don't doubt that you shut out your cat; he just got in there when you were distracted.
You are, though, having either medication interactions or side effects. I would say this is a good time to call up your psychiatrist or GP or whomever and say "HEY! I feel YUCKY!" and see what s/he can do.
Built like a Tauren; aiming for a Draenei.
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