People can have visions outside of being psychotic or on drugs or being haunted. It doesn't happen often, but sometimes people hear or see things that aren't there and are not actually psychotic.

Stress, guilt,unpredictability- all of these and more can do strange things, including induce visual and auditory anomalies.

I agree that seeking some counsel on this is a great idea since it is causing anxiety. I don't agree that the very first stop should be a pharmacy to "make it go away". There are likely issues other than a brain glitch here and swallowing a pill will not help any of those underlying issues.

Secondary recommendation?
Talk to a neurologist if this is suddenly happening out of nowhere, just to be safe.