Paragon's Dialysis

When you initially think something has gone well, but the longer you have to reflect the worse you think you've done. But actually it's all just in your mind and your initial thoughts are the correct ones.

Mick: How did the interview go?
Paula: I thought it went well at first, but the more I think about it, the more I think it went badly.
Mick: Sounds like a case of Paragon's Dialysis
Paula: Yeh could just be a case of Paragon's Dialysis