This website will help you request a "Proof of Income" letter that can be used to prove that you are eligible for benefits.
Can People with Bipolar Disorder Get Social Security Disability?
"Those suffering from either form of bipolar disorder may consider applying for Social Security Disability (SSD) benefits."
Disability Programs (Social Security Online)
These web pages describe the different disability programs administered by the social security program including information about how to apply for benefits, how to manage the benefits you are receiving now, the different forms of health insurance that are available and other information.
Consumer handouts explaining the Social Security Administration's plan to repay more than $500 million in benefits that were unlawfully withheld.