Meds or the combo of meds could be contributing.
Body may not be processing them as well as before.. might start causing problems..
As Drs if there are any non crucial Meds you can stop temporarily as a test to see if they are a factor?

My dad has stopped some meds that were not really giving any benefits and must have been the main cause of his hallucinating, seeing people, delusions.
Those are very rare now.

Vision - maybe ocular migraines with aura?? - [Ocular migraines can develop with or without the accompanying pain of a classic migraine. During an ocular migraine, or migraine with aura, you may see flashing or shimmering lights, zigzagging lines, or stars. Some people describe psychedelic images. It may also cause blind spots in your field of vision.] What Causes Ocular Migraines