Apply through your local social security office or online at social security website. Most applications are denied, and require appeals, some times twice or more. Don't expect a resolution for a couple of years, but if ultimately approved you will be compensated retroactively. There are rare exceptions with first time approvals, hopefully you will be among them
FM symptoms overlap many other disorders so work with your doctor to ensure all other similar symptom disorders are ruled out, particularly if you live in a Lyme Disease region. You will likely have to demonstrate to Social Security that all other conditions have been ruled out. Although Social Security Disability is a federal program, disbility claims received at the Federal level are then referred to and handled by your State Social Service Dept, utilizing their own processes.....so, specific processes are going to vary from state to state.
According to Endocrinologists, doctors who specialize in whole body systemic disorders, rule out tests should be done for similar symptom disorders, based on your particular symptoms, and if applicable:
Examples:
Blood Count for anemia, infection, inflammation
Chemistry Panel for liver, kidneys, lipid abnormality screening, diabetes, and chemical compositon of serum.
Stool Sample Test for candidas and parasites
Thyroid Ultrasensitive Test of TSH
Arthritis Panel, if over 50,include ERS rate check
Ultrasound Abdominal Cavity for liver, pancreas, spleen, & gallbladder
X-Rays
MRIs
Colonoscopy
Endoscopy