Anyone that could help me with this Physical Therapy ?

I have been having low back pain for about the last 6 months. Finally went to my PCP and she ordered an x-ray, results were moderate disc space narrowing L5-s1. She referred me for aquatics and to a pain specialist. I had my first visit with PT already and he said my pain is coming from higher in my spine not the lumbar region. He also told me that I have mild sciliosis, valgus knee deformity's, degenerative hip, my pelvis is shifted and my left leg is shorter. On top of the DDD my PCP already diagnosed. My ? is after 1 exam that lasted an hour can a PT really tell me I have all of these problems ? I don't want to go through steroid injections in my low back if that is not the area causing the pain as my PT said..