No, but I'd just like to offer a hug. I have a student with autism this year, and he has many tics, one of which is coughing (the throat clearing kind). Since Christmas break, he, too has gotten worse. We are all at a loss, and his mom can't get him in to the neurologist until the end of April. We've counted and he's coughing upwards of 400 times a day. The poor kiddos vocal chords are just destroyed. The other students are so good at ignoring it (it is VERY loud, like jump out of your seat loud), and I feel so guilty because it is driving me up a wall. I know he can't help it, and my students are all so sympathetic, but it is taking it's toll on all of us. I wish I knew how to help him! Stimulation breaks don't help at all.
Again, I'm so sorry your son is experiencing this. I hope you find a solution soon, and I'd love any tips, too!