I have recently (over the course of the last year) lost the ability to tongue. No matter what I do, my tongue locks up and I cannot put air through the instrument. I have been using air attacks and K-tonguing, and now I am 100% reliant on K-tonguing to articulate. Does anyone know a solution to this? The more I think about it, the worse it gets, the point of where thinking about fixing it makes me lock up.