But, seriously, I am also susceptible to headaches...in fact, most of my life they have been a considerable problem for me. As someone with a perpetual craving for sweets, I find that limiting my intake of sugar helps me avoid some pain. Also, insufficient sleep can contribute, as can hypertension. Furthermore, it may be a useful idea for you to acquire a specialized mouthpiece that's designed for lead players. If it makes things more comfortable for you, then it'd be well-worth the money to have a means to gaining that upper-register. I wish you well in becoming the world's next Cat Anderson!