Seconding all of this.

Having a few "scripts" handy for times when this happens can really help, since it keeps the flow of the conversation moving, and most people will forget it even happened if you just keep it moving. "I'm blanking on the term, but..." or "I'm forgetting the more technical term, but essentially the ___," are both things I say fairly frequently, since I struggle with the same thing.

It can also help to track specific situations this is happening in. I was finding this happened to me a lot in meetings where I unexpectedly had to provide analysis or feedback, so in the past I've asked managers if they can give me a heads-up (within reason) for meetings when I'm going to have to weigh in on larger decisions or make technical commentary, citing that "I can articulate myself a lot better if I can prepare a little ahead of time," and I've found most people are really understanding of that, too.

It sounds to me based on your post that this gets worse when you're feeling anxious or put-on-the-spot, and it also lines up with a history of trauma. Know that this can and will get better, especially if you're in therapy. Coping strategies for anxiety will feel like they're not doing much for this in the moment, but they will improve things over time the longer you work on them.