'Cause one can never have enough stress

I'm filing for disability this month. When one is born with a genetic disorder what is the 1st day of disability? When I had to stop working full time almost 3 years ago, but did work part time (never coming close to the $ amt that counts as gainful employment) what was my last day of employment? If filling this stuff out drives me to drink can I also add substance abuse to the list of impairments?