Diffuse disc bulge at L4-5 & L5-S1.

6-7 months back i was suffering from lower back pain it was less not creating any issue. It increased later and had to show doctor, increased later and went for mri. Mri report says Diffuse disc bulge is noted at L4-5 & L5-S1 levels causing indentation over thecal sac with encroachment over bilateral neural foramina. Loss of normal lumbar lordosis – Possibly due to muscle spasm. Pain radiates from lumbar area till lower legs. right and left both. it switches, some times pains in right leg sometine in left but more on right leg.  Can not sit for more then 30 min. Can walk slowly for long time. Curently feeling strech in leg while sitting. Doctors recommended physiotherapy, tried it but result waa not ao good. Pain decreased but till some point but no improvment after that. Doing his recommended exercises but its not working out. Pain is always same its traumatizing me can not work can not travel. My work involves 8-9 hours sitting job Please suggest someting.