I have been to the EXACT same situation. It seems you've been through some panic attack. When the same event (presenting my dissertation) happened to me forced me to abandon everything and went through a deep depression for about 4 years 2015-2019. DONT BE LIKE ME. This is a separate event and has nothing to do with the way you generally speak. It might not happen again. Don't let that single event dictate that you're that person now. It just happened, it sucked, move on and don't think about it. That's the best advice I can give you looking back