I know a lot of us have been tested for MS (myself included) because of the similarities, and at least one had brain lesions, but I can't remember anyone on this board who actually got diagnosed with MS. All the symptoms you describe are Mirena symptoms - you need to get it removed ASAP! And recovery may take a while. You definitely want to get tested for MS however, to hopefully rule it out. Many have had low Vitamin D levels and Thyroid, and many get their hormone levels tested as well.
Good luck, and hope you'll post back with your progress!