Mirena has been a NIGHTMARE!

I really feel at a loss right now and not sure how much longer I can go on like this.  I am 39 years old.  I got my Mirena early April 2011.  For the first month, I bled heavily & consistently on a daily basis.  I went in for my follow up appointment in early May.  When I told my OB/GYN that I had been bleeding (heavy) non-stop for a month, she told me that can be common in some women and can last 3 - 6 months... was told to be patient.  So... here I am, almost at the end of the 4 month mark and I am STILL bleeding!  My periods come about every 10 - 14 days, and when I'm not bleeding heavily, I have light (annoying) bleeding in between periods.  As of lately, I am now noticing a horribly foul odor that I've NEVER had before.  I'm at the point of wanting to have this removed, yet feel like the money I invested will be a complete waste.  The whole point of getting Mirena was so I could be sexually active with my boyfriend however since I'm bleeding all of the time, it's been a major mood killer.  Has anyone else experienced what I am?  If so, do you have any advise?