Ty, I don't have TBI/PCS issues but I use canal-phones (so named because they fit snuggly into my ear canals) when I want to listen to music without annoying other people.

They cancel out external noise and noise which spills out from my iPod. A quick Google will give you a list of reliable suppliers - you get what you pay for - I am currently using Shure SE535s which are not cheap but there are many others.