Yes...be patient. I'm one year post Mirena and many things have improved: bouts of nausea, gone....carpal tunnel in wrist, gone...episodes of inflamed, swollen joints, gone...waking up with arms asleep, gone. I also developed an autoimmune disorder called "pressure urticaria" while having the Mirena. Some of the symptoms are similar to the ones you're having with your feet. Any prolonged pressure or friction to my skin anywhere on my body would produce swelling, pain, hives, and itching. (Not sure this is part of it, but my feet would start pouring out sweat within minutes of wearing shoes.) I had to be very careful about what shoes I wore, making sure they didn't rub anywhere and had cushioned soles. Sometimes if I walked too long, especially in heat, the bottoms of my feet and toes would swell and I'd feel like I was walking on sharp rocks. The pain was so bad I'd have to avoid walking for hours but it would improve overnight. In general, the pressure urticaria has slowly improved since the Mirena removal. My thryoid was damaged due to an autoimmune response thatI'm convinced was caused by the Mirena. I also have borderline blood Sugar problems. My labs also pointed to some kind of autoimmune problem with no clear diagnosis.
I'm so glad that evil device is out of you. I wish you continued improvement. Please keep posting and let us know how you're doing.