What Causes Pain In The Hip Radiating To The Lower Back?

good morning, i woke up last wednesday morning and had a sharp pain in my right hip that radiares around to my lower back, i had it everyday since and when i went to my spine dr on this wednesday he did some movement tests and he thinks i may have a tear in something or that it is bone on bone, he has ordered an mri of my hip which i am waiting to hear from to set up, meanwhile i am on prednesone and hydrocodone. the hydrocodone barely toches the pain and last night when i went to sit in my car i had the worst sharp pain in my hip that i almost passed out. my question is, what do you think caused this? i am not into any kind f physical sports and have done nothing different.i am currently under spine care and have had 2 spinal injections, the forst one helped my left leg spasme issue, however right after the 2nd one i had a spasm 2 days later and my left leg is still going numb from the knee down, this has taken a back set due to the major pain in my right hip. it doesn t hurt if i keep real still and walk forward and backward holding it tight, howver any kind of other movement or sitting or standing too long it starts to hurt