How do i get a psychitrists records UNDONE or disproved?

i had a bullying incident back in 2007 and i made an IDLE threat. a 3rd party then broad casted this idle threat. and it started a while chain of concoluted events.i spent ONE NIGHT in observation in the psych ward, now fast forward 4 years im trying to get a very good job that requires me to carry a weapon. i cant carry until i have a F.O.I.D card and the shrink wrote some pretty nasty things about me. how do i get some of those things disproved?