Is an IUD and Mirena the same birth control?

I got Mirena late November 2009 and am now going to change to Implanon.

The reasons are...

1.The main reason is when I breath deep or move sometimesI can feel something shifting in/near my uterus.(Doctor said it Might be the mirena but it's ok if it is)

2.Allmost non-stop bleeding. Remember though, The IUD makes your period funky for 3-6 months when inserted. Even so, this is not a big reason for the switch.

3.During intercourse sometimes not even near allmy partner can feel the strings. And after a while start to hurt.

4.Mirena lasts 5 years while Implanon lasts 3 years. I want the shorter timeframe so I don't need to worry about wasting the Birth Control if I decide to try to have another child before it expires.

Hope I don't scare you from Mirena,because as far as pregnancy prevention, it's great. I'm just giving you my experience. My personal prefrences and sensitivity play a big part in that.

GoodLuck and hope this helped.