Also-call NY and get a letter or something with your diagnosis. It can't hurt to try and they have to keep certain things for 25 years (I worked in a few NY medical offices, so I know this is a fact). I'm not sure how much they keep or for how long, but a diagnosis is definitely something they can find for you and send on letterhead.
Is is possible to drive to the place you worked as a temp and get them to type something up? Tell them you need your work history. It shouldn't be too hard for them to do.