Those are all helpful suggestions in general but OP is describing a very specific thing - having a fear response around speaking, and engaging in frequent word switching and avoidance in order to not have to say sounds/words that have a fearful memory of a previous speaking situation. OP is likely having very frequent unwanted valsalva responses - which is between a mini-panic attack and your body preparing to fight off a wild animal. See this post for links with further explanations by highly credentialed SLP professionals.