The concussed brain often loses some of it's ability to filter out and ignore extraneous stimuli. Those visual and auditory stimuli that we would never notice because they were filtered out and ignored suddenly become noticeable. If we are also experiencing any anxiety, this problem is magnified.

When I suffered a concussion about 25 years ago, I suddenly saw all of the floaters. An ophthalmologist examined my eyes and gave the all clear diagnosis.

At this same time, I also became sensitive to sounds. I could hear echos that nobody else could hear. I've learned to ignore the visual issues of floaters and can even ignore, by choice, PVD clutter. But, I struggle with echos.

btw, My PVD makes it so it is like I am looking through a sort of bird's nest in the early stages. Strings or hairs in a C shape with some clumps and knots.