I too had a friend who had one, and her side effects didn't settle down. She did wait for awhile (like, over 12 months) because she was very keen on the idea of the Mirena, but in the end she couldn't hack it anymore, and even her Ob/Gyn said she should have it out.

I hope it settles soon for you hun, so you can leave it in! I don't blame you for not wanting to put up with constant bleeding/spotting, I couldn't either. Especially when you're supposed to be getting a holiday from it