Buying a pair of custom earplugs was one of the best investments I have ever made. They are not like the foam earplugs that make everything sound muffled. They simply turn down the volume. You can actually hear people more clearly if it is really loud, like at a bar.
Another great investment was a pair of FL-41 tinted sunglasses, which are supposed to reduce the incidence of migraine in fluorescent lighting. I wear them in any situation where there is fluorescent or LED lighting and I find them to be very helpful.
