What Causes Pain In Leg After Inguinal Hernia Surgery?

i have contstant pain in lrq. it has become worse since my inguinal hernia surgery in 2005. I take 10+ aleve a day. the amount of pain I have depends on the amount of aleve i've taken. i now have duragesic patch but it doesn't take the pain away completely. i've had mri, ct scans colonoscopy. the only thing they have found is a herniaed disc at L4/L5, but a back specialist doesn't think that is causing my pain. I desperate for find an answer. i am 47 female, 5ft 7 in tall, 150 lbs.