Have you been checked for ovarian cysts? There have been many cases where the Mirena seem to have a correlation to devloping them. Polycystic ovaries can cause weight gain, missed periods etc.
What do you mean by your stamach is bloated? Is it gaseous, feel like fluid retention, or maybe just the fat deposits that Mirena left behind?
If it seems to be fluid, i would prob have my liver checked out since one very common symptom from liver issues is ascites(bloating, fluid in abdomen)
Hang in there! I had my first period after 22 days, but have been "going through puberty" ever since that first cycle. Greasy skin, zits, the whole nine yards. I thought I was through with that 20 years ago!