Hi, conditions like autonomic neuropathy do have similar type of presentations. “Autonomic neuropathy is a type of peripheral neuropathy that affects involuntary body functions, including heart rate, blood pressure, perspiration, digestion and other processes. Instead of a specific disease, autonomic neuropathy refers to damage to the autonomic nerves that result in a variety of signs and symptoms. This damage disrupts signals between the brain and portions of the autonomic system such as the heart, blood vessels and sweat glands, resulting in decreased or abnormal performance of one or more involuntary body functions”. For more information visit http://www.mayoclinic.com/health/autonomic-neuropathy/DS00544
Other possibilities are vasovagal attacks, cardiac arrhythmias, carotid artery disease, etc.
My husband has been passing out with no warnings. He has had lots of test done to check his heart, and then he had to see a brain doctor to have test done, and then he had sleep study. Yes, he has sleep apnea. He went to work tonight feeling just fine, then he texts me an hour into work telling me that his eyes was blurry, then I told him I could take him to the er and he said no that he is staying at work. Then about 5 to 10 mins. later he was walking into the house. He got into the bedroom and passed out on the floor. I woke him up and all he could tell me that he just wanted to sleep. So I got him up in the bed and he is sleeping now. I check on him and he tells me he wants to sleep. What can this be? This first started in 2012.