Protect yourself
Your company is rarely looking out for you, I wish I had been on when you posted this because its tragic. You should never "decline treatment" always get checked out if you truly hurt yourself on the job, whether or not its something you did that was stupid or its a company issue or simply just bad luck. You only have one body and the more you break it the less you will be able to use it later.
1. You should have gone to see a Doctor (of your choosing) if a general practitioner = get a referral for a specialist on the spot for your next appointment.
2. Always fill out an accident report to your employer, ask for a copy for your records. Often employers conveniently lose paper work, if there was video, then a copy of that too. These are your rights at your work place.
3. This is the trail you should have taken to protect yourself,, right now you have really limited your recourse in this matter by not taking your injury as seriously as you should have.
While you fell off a ladder on film is good, you need the other things as well to go with it. The moment you declined and decided to work through it (any day after this day that it happened) is the moment you opened up a legal can of worms. Now they can say it happened elsewhere even if it was on film. Because you waited so long, because you did not understand your rights. Your employee handbook and/or hiring documentation should have covered the basics on procedures for the workplace accidents and what to do.
Remember your employer is often looking out for themselves of your benefit (there are some exceptions)