Can I do anything about them not honoring a doctors order?

I pulled something in my back at the gym. saw doctor and he gave me a light duty slip for no lifting or brnding. My employer did not honor the slip. Back got 1000 times worse. Went back to doctor again, gave me meds and another silp stating same and set appointment with specialist. Employer still did not honor doctors note. Went to specialist, took erays and MRI...Gave me another note for light duty..once again employeer did not honor...results came back and needed posible surgery...gave me another note....not honored again... back got worse, saw doctor and he said it should not have gotten worse and asked if my employer put me on light duty...told him NO...He called my HR Dept. then after all that 2 1/2 months later I was put on light duty but got so bad needed to have the surgery. Can I do anything about them not honoring a doctors order? Might not have needed surgery if I was first placed on light duty as doctor had ordered.