Upside down pyramid shaped figure in broad daylight hovering stationary over shopping center

We were driving to California for the 4th of July and while on the freeway I was staring out of the passenger side window and got to view it for about 10-15 seconds before it was out of sight from our point on the freeway. It was a fairly large upside down pyramid shaped object, neutral light grey color. I was in the midst of a psychotic episode, but had no visual hallucinations. I was terrified that if I brought the craft to anyone's attention that there would be people coming after me and the ones who knew about it.