Can Vipassana dissolve psychosis? I did 2 10 day Goenka Vipassana courses. And years later developed adult onset psychosis,

I have not maintained Vipassana practice. Just had a physical and it appears that otherwise I’m relatively healthy if that can be said. I can read without interference. It appears that off and on rhythmic repetitive simple worded voices, sounds and difficulty sleeping might be labeled metaphysical “spiritual emergency.” Difficult to label it as “spiritual.” Maybe more like warfare. 

Needless to say, long term the above has a tendency to occlude what is known in secular society as normal function. Can Vipassana dissolve psychosis?
Google defines psychosis as


  A mental disorder characterized by a disconnection from reality.


Causes:


  Psychosis may occur as a result of a psychiatric illness like schizophrenia. In other instances, it may be caused by a health condition, medications, or drug use.


Since what you suffer from sounds more like the temporary kind, I would say there's a good chance that vipassana meditation could help you. Vipassana means to see clearly the nature of reality, and it is effected by cultivating sati, the main characteristic of which is confronting (abhimukha) reality. If you can manage that, I'd say you would be effectively counteracting the dissociation involved in psychosis.

That being said, I've been reading a lot lately about Goenka-based retreats that seems to suggest they are quite intense. I don't practice his technique myself, so I would just like to say that there are many ways to practice vipassana, some maybe more suitable for dealing with your condition than others. Good luck :)