If you're talking to me, my fibro started with various symptoms: fatigue, what seemed to be joint pain (but was in fact pain in the nerves that lead to the muscles) and various other things. The main thing with fibro is that there (at this time per the medical community) no muscle WASTE or true damage. It is not considered to be a progressive disease.
For me - after 20 some years of all this BS, I've worsened to actual muscle weakness and atrophy. I can no longer open bottles or hold things or carry things, etc. My left arm is almost dead and the right is following. I fall all the time and my muscles are literally wasting away. I have no actual diagnosis for what is happening to me now.
Your symptoms do sound a lot like Fibromyalgia, though--which is very manageable--though painful. Most labs will come back normal--as will MRIs and CTs and X-Rays. Fatigue and 'feeling' weak and pain are the hallmarks--along with numbness, tingling, etc. To meet the criteria, as I said, it takes 11 of 18 check points to be positive for pain. They test for this near where muscle attaches to tendons at joints--at the hips, neck, elbow, knees and several other spots. When the doctor presses on these points, it will produce pain.
But you should also be aware that often people with fibro do develop other things later as I did. Many of us with the condition seem to develop auto-immune disorders somewhere down the line. It's a diagnosis of exclusion, basically. Many of my friends with it were later diagnosed with lupus, connective tissue disorders, and other auto-immune conditions.
There are some excellent online resources for fibromyalgia. If you're not experiencing any 'true' muscle wasting, etc...then it's safe to look in that direction