Had the same thing happen to me. At first, I thought I might be having a stroke. It was kind of like having water in my ear, but noisier. I at first tried using a Q-Tip, but that did no good. Then a distant memory made me think of shining a flashlight in the afflicted ear (I tell people I could see the silhouette of the roach project out of the other ear). Couple of seconds later the roach walked out. I saved its body to share with my wife.
That sounds pretty scary. That’s good that it walked out pretty quickly.