Yes. If you have initiated an action against your former employer for violating your rights under the ADA, ADEA, Title VII, FMLA or most any other fair employment law, you have an obligation to mitigate your damages. In other words, the courts and their laws require you to take steps to remedy your unfortunate situation by attempting to earn money. In most cases, that means regularly and consistently applying for work, networking, starting or building a business, attending school, or a combination of those activities. It also means applying for unemployment insurance benefits.
The 3rd United States Circuit Court of Appeals recently ruled that American Airlines improperly terminated the long-term disability benefits of a former pilot. The airline pilot experienced a psychotic episode and was no longer able to fly after the episode. Observers of the case say the most important part of the ruling was how the court explained the remedy for when an employee's long-term benefits are unlawfully terminated.