I worked for two years after my DBS, while it took care of my worst symptoms, I found that work used up all my energy and I had nothing left for my family.

If you have to go in for a SSDI physical, turn yourself off before hand. This will give the doctor an excellent view of you at your worst. Just as long as you say "no improvement" (Which is true when you think about it) I doubt seriously that they'll hassle you.

Charlie