I think I found the answer!

Read this taken form a website, "PMS...A Treatable Problem." Keep in mind the hormone in Mirena is levonorgestrel, a progestogen.
*********************** NOTE *************************
Although the names sound similar, don't make the
mistake of confusing natural progesterone with
progestagens (synthetic progesterone derivatives).
Used in oral contraceptives or prescribed individually,
progestagens (under various proprietary names such as
Amen® or Provera® also known generically as
medroxyprogesterone) probably will not relieve PMS
symptoms. They can actually lower the amount of
(natural) progesterone in the blood, thus intensifying
PMS. Furthermore, PMS (if left untreated) can develop
into menopausal symptoms such as hot flashes and
excessive sweating (see Chapter 5).
Please read up on PMS. I found this very interesting. It seems that those of us who are suffering are suffering from severe PMS, 24/7!
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