What Causes Heartburn, Headaches, Back Pain And Nausea?

My period was different than it normally is... usually i start off pretty heavy for 3-4days and than it lightens up. But this time it started off pink and mucus-like.. than it stopped.. started up the next day and then stopped again... then the 3rd day, it bleed heavy and that only lasted for 2 days... usually my period ends with what looks like old brown blood... this time it ended like it started, pink and mucus-like...

i also been experiencing heartburn, headaches, back pain, nausea...