Purple Orchid gave a great source for info, I would just add that the pain tends to feel like the worst flu you ever had but never goes away or it feels like someone beat you with a baseball bat all night long!
Also there are trigger points the doc can check to see if you react. Usually the pain is thru out the whole body not localized, but with fibro you never know. I sure hope they give you a definate diagnosis soon. Feel free to come here even if you don't know for sure, we welcome everyone!

Hi there!  I just joined this site a few seconds ago- I was surprised that the very first discussion I saw was about fibro!  Here's a link to the National Fibromyalgia Association. 
"What is Fibromyalgia?"  http://www.fmaware.org/site/PageServer?pagename=fibromyalgia
Fibro is typically chronic widespread pain of the muscles and joints throughout the body.
I hope you get some answers soon!
From the same site: Fibro Symptoms

Chronic widespread body pain is the primary symptom of fibromyalgia. Most people with fibromyalgia also experience moderate to extreme fatigue, sleep disturbances, sensitivity to touch, light, and sound, and cognitive difficulties. Many individuals also experience a number of other symptoms and overlapping conditions, such as irritable bowel syndrome, lupus and arthritis.

• Pain
  The pain of fibromyalgia is profound, chronic and widespread. It can migrate to all parts of the body and vary in intensity. FM pain has been described as stabbing and shooting pain and deep muscular aching, throbbing, and twitching. Neurological complaints such as numbness, tingling, and burning are often present and add to the discomfort of the patient. The severity of the pain and stiffness is often worse in the morning. Aggravating factors that affect pain include cold/humid weather, non-restorative sleep, physical and mental fatigue, excessive physical activity, physical inactivity, anxiety and stress.
   
• Fatigue
  In today's world many people complain of fatigue; however, the fatigue of FM is much more than being tired after a particularly busy day or after a sleepless night. The fatigue of FM is an all-encompassing exhaustion that can interfere with occupational, personal, social or educational activities. Symptoms include profound exhaustion and poor stamina
   
• Sleep problems
  Many fibromyalgia patients have an associated sleep disorder that prevents them from getting deep, restful, restorative sleep. Medical researchers have documented specific and distinctive abnormalities in the Stage 4 deep sleep of FM patients. During sleep, individuals with FM are constantly interrupted by bursts of awake-like brain activity, limiting the amount of time they spend in deep sleep.
   
• Other symptoms/overlapping conditions
  Additional symptoms may include: irritable bowel and bladder, headaches and migraines, restless legs syndrome (periodic limb movement disorder), impaired memory and concentration, skin sensitivities and rashes, dry eyes and mouth, anxiety, depression, ringing in the ears, dizziness, vision problems, Raynaud's Syndrome, neurological symptoms, and impaired coordination.

Gabapentin also known as Neurontin usually prescribed for Epilpsy. It's most common OFF label use is Peripheral Neropathy pain. How it got to be used for Fibro???? I use warm water for my fibro. I use Topamax for my PN and Tramadol/Amytriptyline for the breakthru pain.

Neurontin needs to be tritated up to rather large doses for MOST (not all) patients to even notice an effect. And then your body has a bad habit of getting use to that dose, which develops into an upward spiral of ever increasing doses.

It's typically given to patients with Peripheral Neuropathy

MedlinePlus Drug Information: Gabapentin

In the three years that I was on Neurontin, I had all of these:
drowsiness
tiredness or weakness
dizziness
headache
shaking of a part of your body that you cannot control
double or blurred vision
unsteadiness
memory problems
diarrhea
dry mouth
constipation
weight gain
swelling of the hands, feet, ankles, or lower legs

What they don't mention is that the memory issues NEVER go away once you've had them.

Drowsiness/tiredness/weakness did not come even close to describing what I felt and most of my PN friends experienced.

When I first started and every time I tritated up in dosage, I would be absolutely and completely useless to my family. I started at 1800 mgs (felt no relief) and got to 2100 mgs before feeling a difference. By the time I finished I was taking 4800 mgs a day. Some people I know were taking 7000 mgs with no relief.

I got off the neurontin finally in 2006 after coming down to 300 mgs between 2003 and 2006.

I was at 195 when I started neurontine, and hit my highest weight of 250 while on it.

Liz

I have had fibro for about 10 years and will have my surgery in two weeks.  Like you I want to lose some of this weight (about 100#)  but my main goal is to feel better.  I don't expect the weight loss to take away all the pain but I believe it will help and that's all I ask.  I have been working on this process for over a year and I'm just thrilled it's finally here.

The last time that I had a massage, I cried from the pain.  I would hesitate to do it again.