OP, if you haven't been to your doctor and discussed the cause of the injury (such that the doctor would have put it down in the medical record), do it now. Preserve any and all evidence of your visit (ride photo if you have one, other photos taken that day in the parks), get ahold of copies of all of your associated medical records and billing statements, and get thee to a lawyer. The lawyer will need to write a demand letter to WDW, ASAP, so that Disney will be on notice to preserve any evidence within its control (e.g., on-ride photos, evidence of your MagicBand scan, records of the staff working at RnR at the time) before it disappears. Also, sit down and write out a detailed narrative of everything that happened -- what you said to the ride operator, what the operator looked like, what they said -- while your recollection is fresh.
If Disney is found negligent, you will be entitled to damages: things like your out-of-pocket medical expenses, future medical expenses (if any are anticipated) and other monetary losses associated with your accident (e.g., missed time at work), and maybe some compensation for pain and suffering. If you don't actually have any "damages" (e.g., your medical bills were all covered by insurance and the injury is expected to make a full recovery, and doesn't bother you that much), you'll have to evaluate whether you think it's worth it to pursue a claim. Regardless, speak with a reputable attorney. Many personal injury claims are done on a contingency basis, meaning you only pay the lawyer if you win.
(...and yes, I _am_ a lawyer. My 17 years of experience are not in the area of personal injury, but someone who is an expert in that type of practice should be able to assist you in determining whether you have a claim worth pursuing, but you shouldn't delay another minute. Sometimes, medical expenses and ongoing problems from an injury that "didn't seem that bad at first" can spiral out of control in ways you couldn't have anticipated, and OP, it sounds like your injury might be one of those.)
The ER Doctor and my Orthopedic Surgeon are all aware of how I was injured and it is specifically documented in the medical records. There are x-rays and am MRI to prove the injury.