Dissociation has happened to me with and without meds, so I don't know what to say, except that I wouldn't consider it psychosis. It's not pleasant though, especially when you need to focus. I do suggest that you eat regularly as your blood sugar levels can be affected by the antipsychotic meds. Blood sugar levels can affect your feelings of floating and detachment and like you're in a daydream.

In your signature you mention you have PTSD. Dissociation is very common in people with PTSD.

I hope that is helpful.