I'm having aching on my right lower back, under my butt bone to my vaginal bone and a throbbing that makes me feel like I have to pee? Any thoughts?

Sources of Pain. You could have a bladder infection or a kidney stone, or another lower abdominal or pelvic process that is causing the pains. Sometimes, pain from an internal organ gets "referred" to the back or groin. It is best to consult your doctor, or perhaps a urologist to investigate this further.