Hi welcome to the health care magic
Your pain is very high degree, hence here spinal causes or
nerve compression seems most likely....
Spinal joints inflammation, disc degeneration ,
Spondylosis etc like causes needs to rule out..
If needed for that MRI done for detect exact cause
According to cause specific treatment given
If needed nerve decompression surgery,
steroid injection for inflammation relief,
TENS etc are the various modes of treatment
If during examination vascular causes suspected than colour doppler done for that
If no specific cause present than vitamin D deficiency and
musculoskeletal pain might be the possibility
Take care
Consult orthopedic surgeon for examination and further work up accordingly
Hope your concern solved