I Have The Copper Iud In For Two Years And

I have the copper iud in for two years and today off and on have been cramping badly to the point of not being able to function and then the cramps will go away and randomly come back. I am exhausted and not hungry and feel like I'm gonna be sick randomly and have a bad headache. I don't know why I'm feeling like this since I just had my period at the beginning of dec