I think you've definitely come to the right forum. Numbness in hands and feet (especially my right arm) was one of MANY problems I developed. I had the Mirena for 2 years before it started. It's been out for 5 months, but I still have numbness problems that come and go. I especially have trouble with it at night when I'm sleeping, even when I'm not lying on the arm or hand in a way that would make it fall asleep or go numb.
I actually struggled with weight loss with the Mirena, but weight gain is a more common problem, it seems.
This forum has been and still is a life-saver for me. I was perfectly healthy before the Mirena, and I'm a bit of a mess now with many autoimmune conditions.
I wish you luck in your recovery! I think it's wonderful that you've put the pieces together this early. There are some great people on this forum.