Well something is wrong!!!

So i have been dealing with really terrible hip pain for almost a year now and the pain is in my right hip. The pain is really dull and achy and usually stays on the outside of my hip but then there is a shooting pain down my thigh and it stops at my knee and my thigh goes a little numb. I usually only feel the pain when sitting down in a chair for more than 10 minutes or walking for more than 10 minutes. I have gone to the doctor and there have been x rays and a MRI of my hip but there was nothing on them. I have done ice and rest,physical therapy, steroid medication, steroid injections and the doctor doesnt know whats wrong. At first he thought is was trochanteric bursitis and now he sais that he has no idea. He told me to come back when it gets worse. For the past few days the pain has started moving all over my lower back and it is there continually. When the pain started changing i started to be dizzy quite often and i dont know if thats connected but it started at the same time.

Do any of you know what this might be? Or have it and if you do can you let me know because this it terrible!