Mirena situation here! Advice please!

So ladies I have had mirena in for a month and ever since I got it I have started to have back pain. It's only gotten worse to the point now it is very severe and affecting me at work(I am a server). Lifting trays is what I do. So I did some research and discovered it is a side affect of it. I got birth control so I don't risk having a third kid right now but some part of me feels like risking it is better then me having this endless back pain:( Idk what to do. It's horrible at this point to stand up to bend over and pick up my sons :( help please!!! I don't want it to get any worse then what it already is.