I think you know in your heart that all this is absolutely related to Mirena and if you click on peoples names on here you can read their stories. Symptoms are varied. I had the look of being pregnant too and the exhaustion and the mood swings. Along with a whole load of other terrifying symptoms.
The evidence is there. I don't know why doctors treat us like we are stupid. Trust in yourself. Your know your body better than anyone and you know things have changed since having mirena. Get it removed and get recovering. If you have to, say that you are planning to have another child as they will probably try to talk you out of removal. Be strong, this is important! Take someone with you for support.
I'm glad you fouud this site. You will find it an amazing support. Stay in contact and take care of yourself.