Hormonal coil (IUS) and dizziness

I've had the mirena coil for four months, I'm still bleeding irregularly (period every 8 days) and lots of spotting. I've been dizzy for months, I'm feeling very low, I have water retention and a lot of lower back pain that feels like a pinched nerve so I'm battling to concentrate on work. I really want to have it removed but I'm terrified of going back to the alternative of extreme heavy periods that made me anemic.

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 kyleena iud for just over a year. Initially, I had more painful periods but that’s common for about 6 months as your body adjusts but this has since gone away. After about 6 months, I started to suffer with vaginal dryness. This was easily managed with lube during sex but after a year it really started to get bad. It was causing constant thrust (5 times in 3 months) which I had never been prone to before and the pain during sex can sometimes mean we have to stop or I’ll be okay for a bit but then after will be bleeding or have sort of friction burns. It’s coming out soon but it’s just a shame about the dryness as I loved it otherwise