Hi debil,
I was in your situation this time last year.
I'd had the mirena for 3 years with no bleed then started to get bleeding,pmt symptoms,anxiety and generally feeling unwell.
I went to my GP who said that it sounded like the mirena was depleting so she booked me in to have a new one.
It felt like something was going on down below.
When I had my new mirena fitted my GP said I had a polyp which she removed before putting in the new mirena. She sent this away to be tested and refered me for a scan which would take 2-4 wks.
I felt really unwell for a while after I'd had the mirena in.
Convinced I'd got something.
Looked on Internet just like you did and scared myself silly.
I got so bad that in the end my husband got me in with a private consultant and I had an internal scan within 2 days.
I tell you it was such a relief when I was told that all was normal and nothing to worry about.
I cried when I got home because I was convinced I was going to die but realise now that it was all anxiety.
The polyp test came back ok too.
Hope this helps in some way debil.
Dyan X