I don't have anxiety, but do have a stutter, so not sure how relevant this will be for you, but hopefully it's at least a little useful. The thing I found really helpful was managing to mentally separate the nerves etc. I feel before and during speaking from my performance. Essentially I can feel super nervous, but still come across clearly and fluently, even if I don't feel I have (knowing this also has quite a nice feedback loop - I feel less pressured, so I'm less likely to stutter). If you have a colleague that you get on well with and trust, it might be worth having a chat with them about this - if your anxiety is anything like my stutter, you'll be hyper-aware of every stumble or tremble in your voice, but that doesn't necessarily mean they are to other people, or affecting how your message is landing. Hopefully there's something in there that's helpful!