I think that the things you mention seem typical of side effects from the Mirena. I work with two women who have had theirs removed due to the bloated feelings and also tearfulness and extreme exhaustion. Within a couple of weeks they were both back to their normal selves.
These are some of the side effects
"irregular menstrual periods, changes in bleeding patterns or flow;
breakthrough bleeding, or heavier menstrual bleeding during the first few weeks after device insertion;
back pain;
headache, nervousness, mild dizziness;
nausea, vomiting, bloating;
breast tenderness or pain;
weight gain, acne, changes in hair growth;
mood changes, loss of interest in sex;
mild itching, skin rash; or
puffiness in your face, hands, ankles, or feet."
Good luck tomorrow with your appointment. I have similar problems with progesterone and opted for a sequi HRT even though I am post-meno. This means I only have to put up with the progesterone for two weeks out of every four.
Taz x