I really try not to worry and try to relax. But right now, nothing of my usual techniques helps. And during my lessons with students where I have to be consistent and understandable, speech block is really affecting the flow of the class. Students don't get quality lesson and that also affects my grade reputation. I have actually reduced number of lessons lately, but I also have to make living. Even though it is only part time job, it is still a significant part of my monthly income.