Shaky Vet

I am hoping you can help me. I had my C&P exam today for Parkinsons . The nurse called me later in the day, leaving a message, asking for my retirement date. I am now collecting SSI as of Dec 09 when I turned 65. Before this I was on SDI (disability) for a back injury. For a presumptive disease such as Parkinsons is my "retirement date" relevant? I currently am 40% SC for diabetes and neuropathy. I have a claim in for estemic (sp) heart disease also and have never been asked this question. I am worried it may effect my results and I really need the aid and assistance portion of the benefits.