Asking PCP about a diagnosis…

Hello all, this upcoming Tuesday Nov. 7th, I have an appointment with my PCP, who I haven’t seen in 18(ish) months due to losing insurance. During that time, stuff was terrible, and it got so bad with the way I cope with stress, a few of my good fitness told me to look into getting a formal diagnosis. I’m already diagnosed with “Moderate/Severe OCD, and Moderate ADHD, and was on medication for the OCD. In the weeks or so leading up to my appointment, I’ve been feeling hardcore impostor syndrome, and it’s really starting to wear me down. On one side, I’m like “Am I bullshitting myself?” But the other part of me asks “why the hell would youu go through this much internal stress if it wasn’t real for you?” I saw a comment about a month ago on a post, and the OP had said they said or did something for themselves and “logic’ed their way out of feeling like an impostor.” If you see this, I’d love to know what it was you said. Any ideas from everyone on how to cope?