Hormonal coil (IUS) and breast enlargement

I've had the hormonal mirena for 14 months now to reduce endometriosis symptoms. My periods have reduced in length (used to be 3 weeks) and happen irregularly and the pain has settled during these. I have however noticed continuous weight gain since I went on it, despite very little changing in my diet and exercise. I've always stayed at a very stable weight and now my breast have nearly doubled in size and my weight in general continues to creep up. I have tried upping my exercise with no improvement in my weight. I'm the heaviest I've ever been, except for pregnancy. It's a huge price to pay for a reduction in endo symptoms. It's very frustrating.

I’ve had the mirena in for almost 2 years and it’s been working great as a contraception and minimal side effects (very light periods).

I'm on my second Jaydess (been using it for almost 6 years now), before I was on the pill (estrogen+progesterone combination) for about 6 years. Insertion is no fun for me, other than that I can only recommend it. Compared to the pill I have much lighter periods, period pain has significantly decreased (I get a little abdominal discomfort+back pain a day before the start of my period, and that's it). Acne stayed about the same as on the pill. I get a little breast swelling/tenderness for about one week every cycle which I think has slightly increased compared to the pill but isn't so bad. Sex drive and mood stayed about the same, if anything, my mood has become more stable on Jaydess actually (but that could also be attributed to me growing up I guess). Overall I'm satisfied with it