Your symptoms sound hormonal and a bit like perimenopause, so I would speak to your GP or consultant and see whether they would consider adding back some oestrogen/HRT if your symptoms persist. I'm the same age and I had much the same symptoms as a known effect of a different treatment (zoladex) and adding a low dose HRT (tibolone) resolved most of them, so it might mean you can get the good main effect (reduced endo) without as many side-effects and don't have to choose one or the other.
Your symptoms don't sound like what I experienced when I tried Mirena, which is why I think perimenopause is in the mix. I had a negative experience of Mirena and Jaydess (which is a lower dose version of the same) and had it removed at 4 months both times as I had perpetual period pains, sore breasts and low mood. However, most women I know who have tried it absolutely rave about it, so if your symptoms are tolerable I would try to persist at least to 4-5 months to see if the symptoms you are experiencing reduce. I have had so many women tell me about Mirena being the end of all periods and period pains, and the thing that stabilised their mood and other symptoms that I know my negative experience is not representative.
However, if you do have it removed be aware that there is a small chance you may get a big bleed in response as your body re-adjusts, and if you have endo you might get worse symptoms related to that for a few weeks too. I don't want to make you anxious, just to orient you that I found out after my somewhat alarming experience that this is a known thing for a minority of people coming off mirena.
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