Hi, Welcome to Health care magic forum.
The reason for the failure of treatment of sciatica
and problem of L4and 6 may be due to the previous surgery of the cervical vertibrae.
I usually prescribe to my patient with such symptoms neurotropic injections for 10 consecutive days, and then periodically Antiinflmatories, and rubifecient for local application. Physiotherapy
may help you to some extent.
Avoid taking potato, other tubers, tomato, egg, chicken, and sea foods.
Wishing for a quick and complete recovery. Thank you.