Then I jump ship to a new job, and the cycle restarts
I won’t pretend to know your situation, but the way you talk about the cracks forming sounds a bit like you also have an anxiety problem. You jumped ship, you didn’t get fired. I get the feeling that you quit because you felt like you disappointed them.
My friend, you got a degree. You made it through the gauntlet, regardless of how you did it or whether or not you feel like you deserve it. You did it. You are worthy.
The best thing about starting new is that you now have the experience to know what made you fail last time, without the pressure of the people who saw it happen.
It’s not going to be easy, but you can do it. You’re no more an imposter than the rest of us. There are many more people than you think who just wing it. The most important thing is that you get back up and try again.
Keep your head up. Prepare for the worst, hope for the best. And don’t forget to forgive yourself. Things will get better.
Reach out if you need someone to talk to. I have ADD, which is significantly less intense than adhd, but my wife has adhd pretty bad so I do get it from an outside perspective.