Any ideas what's going on with me?

So over the last few weeks / months I'm getting lots (daily) of period type pain however I have a Mirena coil so its not period pain, it's also very painful during and after sex (on occasions leaving me double over).
I have no bleeding.
I am often bloated and find I get full very quickly when I eat. I am permanently exhausted and groggy.
I went to my GP and had bloods last week, they came back "abnormal" and I was asked if they could perform them again this week. They have again returned "abnormal". All I have been told so far is my ferritin levels are of concern and the whole blood count is "abnormal" on both accounts. Ferritin last week was 10.4, then 5 days later 10.0.
A Gp will call me after 5 to "discuss" my results.
I am on a waiting list for an ultrasound.
Anyone has anything similar that can shed some light??
Thanks.