I don’t have any advice because I am in the some boat. Fluent 99% but my own name is impossible and it’s affecting my career. I try to be as calm as possible and I noticed it helps to be relaxed but how to regulate that? Argh :( most times I have a huge block and sound like a derp… sometimes exhaling helps. Sorry you’re struggling as well. Sucks to not even be able to say the own name…