All the comments already posted are very helpful and should help you cope. I will recommend taking off the counter pain killers like Tylenol and L-theanine, 30 mins before any major speaking engagement, the pain killers will numb your nerves and the L-theanine will help with mental relaxation & clarity. In addition to this, keep doing speech therapy related drills on a daily basis along with 10 to 20 mins mindfulness meditation. You gat this 💪