Mild disc bulge l4 l5. Exercises?

Hello!! I had complains of lower back pain since 15days following heavy weight lifting For which i took physiotherapy (TENS ,ultrasound,dry needling and SISfor)7days Later my back pain refuced but started getting excruciating pain in left thigh near the greater trochanter and mild numbness over my shin Throughout this i was on tab zerodol mr bd Nervigen np at night Tab pantop bd I also got mri ls spine which showed mild disc bulge at l4 l5 with compression on just theccal sac. (Films attached) My queries 1. Should i continue physiotherapy when there is pain? 2. Is my mild numbness over shin because of dry needling?? As there is no nerve impingement on mri 3. Is flexion distraction therapy useful in my case of mild disc bulge? 4.when can i start lower back strengthening exercises?