Thanks for the query to H.C.M. Forum.
As this pain , you mentioned that this is from last 3 years and hysterectomy
done with removal of fallopian tube
As nothing is abnormal in ovary (remaining part).
This type of pain may be due to ,
1 Amoebic colitis as this is most common cause , neither pain is too severe nor so mild , only bothersome , can be confirmed by physical examination by a physician and nothing will find in intestine.
2 2nd reason may be due to worm infestation so get in stool examination.
3 Urinary tract
system stone ( calculus ) as this is also most common reason in this type of condition. This can be confirmed by an ultrasound of abdomen with emphasis over left kidney .
4 Last reason may be any disease in pelvic bone ( also femur head
) so please get in bone density
test and consult an orthopedic doctor.