Dear moonisgood ,
Your history is most likely suggestive of Pelvic Inflammatory Disease
which may be aggravated by stress
. Classical symptom being white-brown discharge and backpain. The bleeding which occured after stopping of Primolut is the withdrawl bleeding -a sideeffect of stopping of this drug.
you should take Combined Oral contraceptive pill
(Ethnyl Estradiol+Norgestrol) eg OVRAL -L for for 2 months and Mafenamic Acid 500mg ( tab. MEFTAL) twice daily after food for 5-10 days as per your backache
, if you continue Meftal for more than 5 days,,make sure to take ) Omeprazole
20 mg in Morning before breakfast.
Hope this helps you. Stay healthy stay Cheerful :)