I didn't go to law school, but this appears to be a complicated case. Depending on the state in which you live, I would assume you could potentially have a case because of the fact you discovered you were intentionally harmed years after the accident happened. In this instance, since you've been suffering from PTSD and BDD, two serious mental conditions, a "Discovery of Harm" rule could work in your favor. On the other hand, courts are usually pretty firm when it comes to enforcing statutes of limitations. It really depends on the state you live in.
The smartest thing for you to do would be to speak with a lawyer in your area. By providing them every detail you can remember about your swing accident and the mental damage you've suffered because of it, they could advise you as to whether you have a case all these years later.
I found this link while doing a little research online. I hope it helps: (removed)