The only "diagnostic" is the 18 tender points. There are several examples and if you have 11 or more, you supposedly have fibro. (When I'm in a flare, I have 14; when I'm not, I have none.)
Some people have dismissed the chart as obsolete, so take it FWIW.
The thing is, as we've shared information here, we've discovered many commonalities. We, together, have probably done more exploration of fibro than the medical community.

@A MyFibroTeam Member A MILLION THANK YOUs!!! I greatly appreciate it. 😉😊

Mentioned Users

A MyFibro...

Fibromyalgia Symptoms:
Aggravating Factors

Chest Pain
Chronic Headaches/migraines
Cold & sore throat symptoms
Depression
Dizziness
Muscle Twitching
Tremor
Severe Fatigue
Fibrofog
Morning Stiffness
Chemical Sensitivity
Myofascial Pain Syndrome
Anxiety
Skin Complaints
Sleep Disorders
Joint Disorder/Pain and swelling/peripheral idiopathic edema
Peripheral Neuropathy
Urinary Problems
Widespread Pain
Dysmenorrhea
Nausea/Vomiting
Memory Loss
Flares brought on by Weather Change (Temperature) and Altitude Changes
Fibromyalgia and PMS
Fibro Breathing Trouble
Weight Gain
Hemochromatosis
Restless Leg Syndrome
Reactive Hypoglycemia
Magnesium Deficiency
Sensory Perception
Auditory Perception Disorder
Chest /Jaw/Neck/ Facial Pain
Morning Stiffness and Pain
Skin Problems
Dizziness and Balance Issues
Nausea and Gastroparesis
Cold Weather Effects
Fibro Forgetfulness
Tension Headaches
Diabetes Insipidus
Vision Effects: dry eye, blurred vision
Irritable Bowel Syndrome
Irritable Bladder Syndrome
Interstitial Cystitis

@A MyFibroTeam Member Thank you so very much. SEMPER FI TIL THE DAY I DIE 😉

Mentioned Users

A MyFibro...

I have found that even though we have been diagnosed with Fibro each of us may have different symptoms/ other disorders. Depending on the day, time, and what activities are going on in our lives some symptoms are are more prevalent/intense than others. Like some one else said these symptoms all over lap with other illnesses/disorders. Just like the side effects of medication we generally are told about the more common ones.