I have had lower back ache for the last month or so which I would describe as a pre menstrual ache.  It also seems to radiate to my lower abdomen.  I have had clear/yellow/creamy discharge for about the same time, not offensive at all.  My abdomen is tender on the right side when pressed.  I am not pregnant.  What could this be?
Thank you for sharing your complaint, if you have pain on back/flank with abdominal pain which radiate to pelvis/bladder and sometimes it may be associated with burning or difficulty in urination, you should keep in mind possibility of ureteric/kidney stone. Tenderness and pain on right William fossa also indicates of appendicitis. So you should first confirm diagnosis by blood & urine investigation and also sonography of abdomen and pelvis. After final diagnosis take medicine rather than taking medicines randomly. Low back pain may be due to muscular pain. For temporary relief you can take analgesics like ibuprofen or muscle relaxant like diclofenac+paracetamol+chlorzoxazon, with omeprazole/rabeprazole.it will relieve back pain and abdominal pain. Hope this answer will be helpful to you. For more queries please don't hesitate to ask. Get well soon dear friend