Stupid IUD!!!

I have the mirena for 21 days and ever since it was put in place I never stopped bleeding. Damn this is getting so annoying like when will this ever freaking stop. I called the doctor and they say its "normal" um a period type bleeding for 21 days is normal? And I don't think its going to stop anytime soon it just goes on and on and on. I'm to my witt end I'm so emotional its like Im always wearing a tampon or pad I had to stop wearing tampons for a little cause my bag was hurting from wearing them always. Anyone have same thing happen? What did you end up doing? Did it ever stop?