Auditory and visual hallucinations can come and go for some people; especially if a person is on a good regiment of medication. The trick is finding the cocktail of medications that works. I used to have auditory hallucinations all the time, with periods of visual hallucinations as well. Now, I am on a good mix of medication that seems to work. I still occasionally have hallucinations, but they are not as frequent as long as I am on my medication.