I can no longer play with inverted mouse control (the perils of neuroplasticity)

After a half-year playtesting an Unreal Engine project with my group, my brain has been rewired to control the player virtual camera the same way that more than 60% of videogame players do. I was struggling repeatedly to regain the combat effectiveness I had before the last year. Game featured: F.E.A.R. (First Encounter Assault Recon) by Monolith Productions