I have never had that. I did have a period for six weeks straight one time. OMG it was ******* terrible. I went to the Doc and they said nothing was wrong though. I would definitely see someone about it though, just to be safe.
If you have an IUD it's "normal". But there's nothing normal about setting off metal detectors with your uterus now is there? (Trips to the Fed Bldg are SO humiliating)
I'm not saying this is your problem, but I know someone who just had surgery where it was discovered at 28 years old that she has two separate uteri, and two separate cervixes. She was always on the rag, and now she knows why.
I knew a girl who was like that too. I think it was from ovulating from both ovaries, instead of one at a time per month.. In other words, you're SUPER-Fertile ^_^ lol