I can relate totally to your situation.....never any issues with anxiety/ Depression prior to Marina.....any way I have had the marina out for just over a year now and am glad to say I am much better. Like you I have felt better in the second half of my cycle (not sure you are the same but I feel at my lowest during and towards the end of my Period (although some month there were other times also) I also thought through internet research that I was estrogen dominant......so I was surprised to find I am oestrogen deficient! (progesterone isnt great either but it was the estrogen was quite low). Now most my my symptoms have improved over time, but some still remained, rather than dizzy all the time it was just in the days before my period, brain fog memory issues were worst during my period (which went for ages eg 12 days), as were Depression anxiety (which is the symptom I HATE the most), stabbing pains have gone. Anyway I have just started trying a low dose of bioidentical estrogen (my Dr suggested it long ago but I was too scared after the Mirena episode).......well so far it is great....it took a week or just over to kick in but I feel calm and happy and clear (like the soup which my brain seemed to be made up of for so long has been replaced with working brain cells), I feel motivated to do things (I was fine with regular things but now I can actually think of fun family activities on the weekends!), I am sleeping soundly (not waking in the middle of the night for a couple of hours which used to be part of my monthly cycle also).
Now I am not sure if this will help you or not (and I must say although my oestrogen levels were low (bottom of the scale the were not catastrophically low)). But for me it illustrates just how much a drop in our hormones can impact us. I am coming to the end of the first month taking the estrogen and I have to have a week off (during my period) but so far so good. Apparently it takes 3 months for your body to regulate to the hormones but so far so good. I really didnt want to take anything other than magnesium and a multivitamin but eating well and time just didnt seem to be cutting it anymore! I dont see it as a permanent thing just until my body starts to ovulate properly again. And to perhaps break the cycle of my anxious thinking (if that makes sense).
Good luck. The answer is out there somewhere.
Just a quick question. How are you blood Sugar levels (mine have been all over the place since the mirena).