I am talking with a girl for two months now.She's not my girlfriend yet but things are heading into the right direction.Should I tell her now about my PIED or should I wait till is something serious?
Probably something you shouldn't bring up until you are ready to sleep together. If you mention it earlier than that she may start making assumptions about why you are in the relationship.
Huh why say anything? why are you already setting yourself for failure? The moment you mention a "problem", it's a psychological game over for you, watch out and don't fall to classic PA dude. I've overcome severe PIED & PA 10 years ago, there are better healthier ways to reconnect those neural pathways, without any of that stressful nonsense.