Has endometriosis been diagnosed any time? Or it sounds just similar to Dysmenorrhoea or pain during the menstrual bleeding.
Apart from that you seem to be having an underlying urinary tract infection.
Caladiums, Cantharis, Staphysagria are few of the Homeopathic remedies that would help get rid of the pain and the urethral symptoms.
I am sure you should try Homeopathic medicine.
This is an article contributed by me to a national news daily in India, THE HINDU.