Just adding my two cents here regarding MS symptoms. Post removal (while body had no progesterone and no progestin) my shakiness, clumsiness, dizziness, increased until after my cycle began. I am now almost seven months post, feeling better every month :-0, and can tell you that my period will be the week following a recurrence of these MS symptoms, sometimes they aren't as pronounced, but as the levels of progesterone dive triggering menstruation, I begin to drop things, become clumsier, get dizzy, etc. It's tolerable and nothing like the constant of having mirena.
It seems that for me PMS time when progesterone levels are lowering, the mirena symptoms come back in some form, but not as bad.
I had 2 mirena for 5 years and 9 mos. and expect that getting back to 100% will take time. BUT I am so MUCH BETTER.