This imposter feeling is relatively new for me. For nearly 15 years I was chronically suicidal and pretty much constantly in deep depression. I self medicated for years, heavily. I think this masked a lot of my hypomanic episodes, but I also didn't know what one was and never heard of bipolar 1 or 2 or maybe I didn't have any but I definitely was depressed. I was in a haze. It was only when I stopped all of this that things got worse. I only got diagnosed a little over a year ago due to a really bad hypomanic episode. I started meds shortly thereafter. These imposter feelings only started happening in recent months and I just find them odd. It's like I lost my identity. Not that that's the identity that I want, but it really was my identity for pretty much my entire adult life. Thanks for your reply though, I'm just trying to figure out this new medicated world. It's weird.