Back painn. What can be her problem?

My mother is having a back pain for more than 5 months now. The back pain is usually located in the right side a little away from the spine and in a strip. She had no injury, xray showed early symptom of lumbar spondylosis but she has excruciating pain. The pain is dull and constant but sometimes it gets unbearable after getting in one position or so. She had her blood tests done. Apart high cholesterol nothing abnormal was found Also the pain doesn't usually radiate anywhere but from last day she is feeling some pressure in her nape of neck and heavy head and dizziness and her ear is getting clogged sometimes. What can be her problem? The pain doesn't travel down to buttocks, or leg, so how can this be sciatica. Please help me out. Please.