If your doctor tells you that it will go away, you need a better doc...

Everything leaves a permanent mark on you, mental or physical, even if you don't notice it. It's how we managed to survive for so long, by adapting to new things constantly. The system is pretty crude, but evolution is crude and merciless, long term quality of life has never been it's primary 'objective', only making the species fit for survival. Mental stability isn't all important in the grand scheme of things, not when plenty of other things will easily kill you sooner and easier.