Dark Brown discharge/clotting

I am 21 years old, and I had a C-section seven months ago.  In September, I had the Mirena IUD put in.  The normal side effects such as cramping and spotting are still hanging around.  I am not too worried about that.  About a week and a half ago I started getting very dizzy and had heart palpatations, which I have never had in my life.  Two days later, I had a pretty severe migraine.  The next day, I discovered that I had a bladder infection, which I have also never had.  I took Cranberry pills as well as no sugar-added juice and some vitamin c.  The bladder infection is still hanging around.  Now, Thursday, I started spotting heavily.  The discharge was dark brown and along with that there were large clots, the size of a golf ball, but very stringy.  I am a little worried right now and my ob/gyn is out of town.  I just had my period two weeks ago.  This is new and a little scary.  Anyone have some insights?

[babynr]

Yes..you need to see SOMEONE.....might not be a bladder infection, rather Inflammation in your Pelvis....dangerous...go to an Urgent Care or ER...don't mess with your fertility.  all the best.