Mirena and numbness of hands

I got the Mirena in July because I was bleeding so heavily during my periods and had low Ferritin - not anemia yet, but potentially close to it. SO I chose to have this inserted, and the past few months have just seemed to get achier and achier. I could also have a B12 deficiency which is being looked into, but is this a side effect that has been reported frequently? I've also had more headaches than usual, and numbness of hands/feet, a classic symptom of B12 deficiency. But still - the achiness is freaking me out.