Back pain. Can be done away with.

Back pain since 13yrs. Was in control by doing simple back bending exercises/asanas lying on stomach. Met many orthopaedic doctors in reputed hospitals . Got X-ray , ct scan done . MRI lumbar sacral spine reveals spondylytic changes with L5-S1 intervertebral diffuse disc bulge compressing thecal sac & causing mild narrowing of the neural foraminae. Also suffer from constipation inspite of very healthy diet full of fruits , vegetables chappatis . Sleep 2 hrs after dinner. I avoid maida in diet. Wt 68kg (presently 66kg). Ht 5'7". Presently back ache under control by exercising 45 mnts daily for 20dys a month approx. Nature of work such that have to sit 2-3 hrs in one stretch. Whenever I miss exercise for 2-3 days problem starts. Is there any other permanent treatment so that dependency on exercise can be done away with.