my friend has sleep apnea and developed a sphenoid infection after using c-pap for a few months, after months of antibiotics and finally surgery to scrape out the infection it still didn t improve. The symptoms are pressure in the eyes with selling and new dark circles, head aches, fatigue and general feeling of malaise and most recently numbness in the feet. They ve run all kinds of tests and still don t know what s wrong, any thoughts?