Mirena and joint pain

Ladies, I've had my IUD for about 6 months now and maybe for like the last 2.5 weeks, I've been having severe pain in my lower back to the point where sometimes I feel like I can't move. It's work when I'm laying down. And then about a week ago, I had the baby in the bath tub on my knees and when I got up my left knee was hurting. I assumed it was because of that but it's still hurting now. This weekend, my hands and feet started feeling stiff. Almost feels like I'm walking on swollen feet and my fingers/knuckles hurt when I bend them. I've been going on google and it says that the iud can be associated with RA. Has anyone else experienced these issues? I have an appt next week to make sure it hasn't moved but almost tempted to go to the ER