I had the same problem and it was the differential and the axell that was bad, the dealer repalaced it for free it was under warranty
Yes, shaking is a common symptom with Fibromyalgia. You may experience full body shaking or just shaking in one limb. However, shaking could also be a symptom of something completely unrelated to the Fibromyalgia. If this is a new symptom, you should report it to your doctor so that they can examine you.