If it refuses your request or finds against your claim, you can file a lawsuit in federal district court. This is your final chance to prove your claim, unless you want to start the entire process over again.
Sources:
Aug. 29, 2007, U.S. Social Security Administration"Social Security Protection If You Become Disabled"
2003, Disabilitysecrets.com. All rights reserved. "Social Security Disability and Fibromyalgia"
2007 ProHealth, Inc. All rights reserved. "Chronic Fatigue Syndrome and Fibromyalgia Patients: Should You File a Disability Claim?"

