Mirena has a whole host of side effects that are not fully disclosed by the company by way of generalization or glossing over. So, yes all of these things you are feeling could be side effects of your Mirena. And the side effects of the Mirena often manifest around the 3 month mark, and can take up to 3 months to go away once the device is removed. In my case I experienced side effects 3 weeks after insertion and they went away three weeks after removal - so there's a lot of variation. My side effects did not go away while I was using the IUC which is why I had it replaced with the non-hormone copper IUD. But I have friends who had side effects that did subside and go away and are very happy with their Mirena.
A lot of doctors and healthcare professionals do not recognize or acknowledge many of the side effects caused by Mirena. Mine did not and in the end the IUC was clearly the cause of the severe side effects I was experiencing, but it took over a year and a half to get it recognized. In the meantime my Dr told me she did not know what was causing my symptoms and we just kept treating them until I got a tip that it could be the IUC and I had it removed, eliminating the problems within weeks.