Hello
You are suffering from BPPV ( benign positional paroxysmal vertigo) , in which if you move your eyes or head , you get a spinning feeling with nausea or even
vomiting.
Sometimes mirena birth control can cause BPPV.
I would suggest that you have a review of
ENT specialist , for dix halpike manuver +
stemetil +
clonazepam for symptomatic relieve , and a gynaecologist review for changing mirena.
Hope this helps