For the past 4 years, i've had debilitating vaginal pain and pain in my right leg below the knee. it comes exactly at the start of menses. ideas?

Mentstrual pains: Your symptoms can sometimes be explained by the activation of "endometrial" tissue by the drop in estrogen which occurs at the onset of menstrual bleeding. This may be due to "endometriosis" , which can cause pain in both vaginal areas as well as seemingly anatomically unrelated areas. Consult your gyn provider. Oral contraceptives often can relieve these kinds of symptoms.