Seconded on checking for sleep apnea. I'd wake up every night after approx. 4 hours with severe sweating, palpitations, tingling and numbness in hands and feet,

Seconded on checking for sleep apnea. I'd wake up every night after approx. 4 hours with severe sweating, palpitations, tingling and numbness in hands and feet, acid taste in mouth, disorientation. I was tested for everything under the sun. EKG, stress test, echocardiogram, blood workup, blood sugar monitoring (diabetes?), Holter monitor, xrays, .. on and on. They showed nothing. Several of the doctors tried to gently broach the idea of "stress" perhaps being the cause. But as far as I can tell I'm mentally healthy and a low stress guy. I went through years of doing my own "research". I suspected everything from heart valve infection, to kidney disease, to lyme, sleep apnea, to some exotic virus. 8 years of nightly misery and soaked sheets. I suggested apnea to the doctors several times but it was waved off because I'm thin. I even had an ENT specialist put a camera down my nose looking for something "structural". Nothing. And yet, after getting a CPAP my symptoms have all but disappeared. WTF? I felt my doctors were caring and competent. How did they blow this so badly?