Had my pension taken away because I was put on S.S. disability after retirement for multiple health problems.

Social Security Disability Income automatically morphs into Social Security retirement benefits in the same amount when you retire.  You cannot receive both at the same time.  It seems unlikely that a pension plan would penalize a member for receiving Social Security retirement benefits.  Once you have clarified the situation, take your pension plan and Social Security documents to a lawyer specializing in that area.