The only thing that will impact your FAA Medical and your job is lying. Period.
If you have a service related disability, claim it. If paper work for said disability needs to be filed with FAA do it.
DO NOT, pretend you don't have this disability and hide it from the VA and the FAA. Even worse, DO NOT file with the VA and then not tell the FAA, that will get you in more trouble than you can imagine.
The worst, don't pretend you have a disability and lie to the VA and the FAA.