@melina21
Have you seen a gynecologist for pelvic exam and transvaginal ultrasound? Have you had an ultrasound of your abdomen or MRI of pelvis/hips?

You may want to investigate issues with ovaries/uterus, endometriosis, pelvic floor, etc. If you do not find anything after this investigation, you may want to pursue an orthopedic doctor to do MRI of your lumbar spine/sacrum/pelvis to see if you have compression impacting your spinal cord/nerve roots/nerves. This may be a source of your pain.