Back in 2001 (post 911), I was working for a major travel company when I had to stop working because ...?

medical issues associated with Cancer and pyschological problems pertaining to my health, deaths in my family, the office enviornment itself and post 911 stress; I've been on Social Security disability since, but just remembered that I'd also checked "double" my yearly salary and had money deducted from my paycheck; that would mean 80K per year that I haven't recouped; Can I still get that past due money; I would assume I'd have to repay Social Security which is the right thing to do...