Social Security Questions? Ask a Social Security Expert
I'm not going to be able to answer your question, but any expert will need to know some of the following:
Social Security's definition of "disabled" means "unable to perform ANY job", not just jobs similar to what you were doing. Was that the case in 2006?
Is "Long Term Disability" referring to a disability policy which you had through Primerica, or Social Security disability? If the former, then their definition of "disabled" is probably more generous than Social Security's.
Social Security Disability benefits are converted to retirement benefits at some point; I'd have to research whether it is age 62, full retirement age (probably 66), or when you actually apply for retirement benefits, if I were to answer the question completely.
And $25,000 sounds reasonable. My wife and my deductible medical expenses were around $40,000 for 2014.