If an injury was the direct or indirect result of the OP's mental illness I would agree that compensation was appropriate. Otherwise I would ask that the judge dismiss the case. (Me playing defense attorney)

The question as I see it - are you any less capable to instruct people in the use of firearms focused on safety, education and responsibility than you were prior to being diagnosed? I don't know but I would suspect that after being placed on appropriate medication you are now more competent.