chronic back pain relief?

im 19 and i have had chronic back pain for 3 years now and its getting worse all the time. im constantly weak and my hips and knees also hurt a lot especially when im walking around and going up stairs etc.

i have to take tramadol, co codermol 30/500 and diclofenac sodium at the maximum dosage every day and they make me really sick

i have been through both physio and hydrotherapy and its done nothing for me...even made it worse and when i went to see the rhumatologist she sent me back to physio. she said that she thinks that my spine at the bottom is more curved than it should be.

She doesnt want me to have pain killing injections because they only offer short term relief

my bloods were normal, as was my mri scan

is there anything else i can try to help ease the pain?