I found this article interesting. As a memory athlete, I've clearly seen how stress diminishes my ability to memorize and recall at memory competitions.
I've seen it in my fellow competitors as well. Those who are better able to manage the stress of a competition tend to do better.
As the article discusses, though, anxiety is different. Many of my coaching clients and people at my keynote speeches and workshops tell me about their "horrible memories." After further discussion, though, some reveal other issues that are either contributing to a diminished memory capability or even causing the memory problems. Often I'm able to point them in the right direction so they can finally get to the bottom of what's causing the problem; they can then see remarkable memory improvement.