What do you believe about karma?

I am 21 years old, and I went deaf about two years ago.  I was only 19 when I went deaf.  I'm dealing with it pretty well, but it's hard for me to believe that I did something horrible enough that I was meant to go deaf and have the terrible disease, Susac's Syndrome, that made me go deaf. Gaia and Thinkarete.com have helped me overcome the situation in which I have been put due to this.