Chronic back and leg pain. Disc issue?

Developed back and leg pain in 2016 after doing 35kg weighted squats in gym. Some doctors considered it as minor disc issue related to L5-S1 others considered nothing to be specific. Tried physiotherapy and exercises and got no relief. From the last year, pain was little bit settled, especially there was no leg pain. Recently i did CAMEL Yoga (USTRASANA) involving hypertension for few days, my back and leg pain again started. Can the extension based exercises (like USTRASANA) further damage to an already existing disc issue? Note: Extensions like COBRA pose suggested by doctors in the initial days always used to increase my leg pain. Symptoms (present): Lower back and both legs pain, pain scale: 5-6. Trying heating and gentle oil massage for now. 1st MRI (2016): Report: L5-S1 posterocentral disc protrusion causing indentation upon thecal sac and mild narrowing of bilateral lateral spinal recess. Last MRI (2019): Please see the attached images of report and digital images.