Sphenoid Sinusitis: Headaches, Fungal Causes, and Treatments Have you ever had a headache so bad it seemed like your skull was splitting? I when felt like that, curled up in bed, unable to face the sunlight. I was dealing with sphenoid sinusitis, a condition that can actually tinker your life. https://sleep-apnea-mouthpiece61593.blogdigy.com/everything-about-sphenoid-sinusitis-47050607