That isn't derealization, since it isn't mental rather based on physical issue inside the brain, receptors aren't triggering since they are broken or blocked by invega. It's called numbness accompanied by cognitive issues and likely other issues, you likely can't grasp complex structures when you see them. It's likely only pain and suffering is what you can "grasp" currently.
The numbness and cognitive issues like "focus issues" are interconnected. Have you tried to drink alcohol? It's known alcohol decreases ability to focus, especially in combination with invega.
This numbness isn't a state of mind, it will follow you in dreams too, I remember I would be the same in dreams, and therefore I even suffered in my dreams to extremes.
How is your perception of passage of time, how's the music and coffee/alcohol?