What causes lightheadedness while singing with grit?

I was recently made aware of epiglottal vibrations crossing over into my grit, so I've been consciously avoiding that. But the strange thing is, as soon as I have, trying to keep a more pure resonance higher up in my head, I started to experience lightheadedness, which has never happened before. What causes lightheadedness exactly? Am I tensing my neck too much?

2 comments