I.L.
Please remember, when you had the Mirena you were giving your body a steady stream of hormones, and now it's not getting that. It has to have time to adjust back into its own sustaining rhythm.
A few things you could do to help with the balance is take a few supplements. Do you take vitamins? Right now a good b-complex vitamin could be of great help. Also taking an omega-3 supplement, preferably krill oil. Vitamins are one area where you certainly get what you pay for. So the bottle of 500 capsules for $5 is not going to do you any good. Go to your local health food store and talk to someone.
These won't be a miracle cure, but they will help with getting you some balance.
I was on the pill, problem free, for 15 years. I had a non-hormonal IUD placed almost 2 years ago. The first several months of not being on a hormone and letting my own body find it's balance was a roller coaster.
Be good to your body. Eat well, sleep well, exercise. This to shall pass.