I have recently stopped taking birth control . It s been about 3 weeks. Since then, I have had frequent urination , headaches , abdominal pain , cramping, and no period. I have also had a slight fever for the past 2 days. I went to the doctor today and after a series of tests, they ruled out any STD s, pregnancy, or infections, but the pain is still there. Is this due to me stopping the pill or should I get a second opinion?