Your pain describes what I am feeling as of recently. I know that groin and pubic pain comes from a hip joint. I hope you are of an age, when hip replacement is not an oddity. Your back and buttock paini are also related to it. You have to see a doctor and have an x-ray of the hip taken. So far there are no non-invasive interventions for this condition, like growing new cartilage in the joint, which is worn out. Hip and knee replacement are too lucrative sources for drs. to stimulate and seek further research on methods of implementation of new cartilage. So good luck.