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Areas of increased T2 signal on MRI are very common and non-specific. Sometimes they correlate with clinical symptoms and sometimes they don't. The effects of such areas of inflammation or scarring can be highly variable depending on where in the brain they are located. In any event, they have probably been present for a long time, months to years, and may not explain your current constellation of symptoms. Dysautonomia would certainly be possible though this does not usually result in joint and muscle problems. One way to put it all together, along with your history or fibromyalgia, would be an auto-immune or auto-inflammatory process, which can affect all bodily systems, including the brain. If you are working with a rhuematologist, you should check in with him or her as soon as you can for further testing and to fashion a treatment plan.