New to the IUD

Genesis
So i recently just switched from the implant to the IUD about 2 weeks ago. I was mid cylce when they inserted my Dr said that it would make it easier since I have not had kids yet. The first day i got super dizzy and had the worst cramps of my life. Well 2 weeks later I am still cramping on and off has anyone else had this problem if so how did you fix it?