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
for symptomatic relieve , and a gynaecologist review for changing mirena.
Hope this helps