If U put 'mirena coil' into the search box threads will pop up. Make notes ;-)
As for an anti-anxiety medication some do take something along with HRT. MayB think which symptom you would like to ease first, something to discuss with the Doctor [on a Sat ?? ]
Some antidepressant medication ease hot flushes, 'venlafaxine' springs to mind.
Let us know how you get on.