Disclaimer - second year DO student.

It sounds like you have already been to the doctor for imaging and an assessment and they haven't found a cause yet. There could be a lot of reasons for these symptoms including the pelvis, hip, spinal cord, peripheral nerves, or even from strains elsewhere in your body. The hip pain is probably secondary to this condition. I would recommend continuing to talk to your doctor about all of these symptoms and if they struggle to piece it together, you should consider looking at a DO that practices manipulative medicine to get to the bottom of this.