Back pain in your profession is very common. It's mostly due to bad posture, lack of exercise and low
vitamin levels. It's a good idea to get your
vitamin B12 and D3 tested ( simple blood test).
Next Steps
If your
vitamin levels are low. you need to take regular vitamins. You should also do regular back exercise as your physiotherapist had shown.
Health Tips
If the pain still persists you could be suffering from slip disk. You need to get an MRI scan in that condition.