What Causes Irregular Periods,abdominal Pain,heart Burn And Headache?

I keep having all of these symptoms: lower abdominal pain(kinda feels like stretching), random chest pains, more discharge then normal, heartburn(unusual for me), a little bit of breast soreness, headaches, and my period for this month started the morning of the 16th, and till the night of the 19th, stayed the exact same flow, and then all of a sudden stopped. Then it started back up again around 4pm on the 20th but only for about a half hour, then stopped, and then started again at 11pm that night. What does all of this mean?