Increased SSi benefits

I retired in 1996 at age 63 and began receiving regular benefits. At that time I had been diagnosed with peripheral neuropathy. While it was not of a debilitating nature at the time, it not affect my normal activities. Now at age 84 the malady has greatly affected my ability to stand, walk, and maintain my balance. In addition, my prescribed medication (Lyrica) affects my mental capacity to find employment as a programmer/analyst. My physical therapist advises against driving my car. I'm interested in getting an income increase. I worked a full 40 quarters.