Hello Mysterbyhealth,
Welcome to this forum.
I'm disappointed the ladies have not responded to your post. SOOOoo here goes as a male.
First, I am not a doctor. However, I will give you my thoughts. -
I would highly recommend that you stop using the IUD. AND, you won't like this, however, at this time it would seem intercourse would not be advised not knowing if the IUD has caused any damage or not.
I'm glad you have changed your GYN.
Now seek advice from a neurologist/spinal surgeon. In fact, seek the medical advice from the BEST spinal doctors (with MD in back of their names) that you can find.
I wish you the best.
RichT