How To Heal Pain/tenderness In Lower Pelvic Area?

For about three weeks I have been experiencing pain/tenderness in my lower pelvic area. It comes and goes. One day I m fine, next day hurting again. Had an abdominal/pelvic ultrasound as at first I was worried my one remaining ovary (had hysterectomy in 1995) was causing problems. The report was all negative. Urine test also negative. I also sometimes feel somewhat bloated. Bowel and bladder habits unchanged.