Sorry this happened. I had a lot of similar experiences in throughout my entire school years and i know the exact frustration you’re feeling, and it really sucks. The stress and spotlight of a situation like that, like you “feeling like I’m going to have a panic attack” like you said, that heightened emotion and panic state, that’s a sure fire way to trigger a bad speech block. Learning to control those panic states better is a huge help, but it takes time, and work, and vulnerability.