I have fibro, was diag. With extreme fibro fog 2 days ago & body jerks all over, but now stumblin', swayin' when walk, feel like fallin bakward, fibro 2?

Fibromyalgia. Fibromyalgia is often associated with myoclonus, a brief, involuntary twitching of muscles. That may explain your body jerking all over. Stumbling and swaying could be either due to fibromyalgia-related muscle weakness, possibly of your legs, or medication side effects. But you may have some other underlying neurological disorder such as multiple sclerosis... Please check with your doctor.
No. The symptoms your are describing do not sound like fibromyalgia. They sound like a drug reaction-if you are on any sedating medicine (like a muscle relaxer or seizure medicine) it can cause this. Talk to your doctor.