What Causes Cramps And Odourless Brownish Discharge?

Hi I am 30 years old, I have bled for 6 months I finally got. Back to a regular cycle 2months ago. Now I have been getting cramps and pains in my lower right abdominal area and my back. My appetite has also increased , constantly nausiated and very tired. This has been happening for 6 days now. And i just had an odorless brownish discharge. What could b happening to my body now. I am also sexually active.