My husband has appeared EXTREMELY Tired for a few days. He can't keep his eyes open for more than 5-10 min at a time. I've just thought he was tired, he is diabetic. I've been checking his heart rate always in the 115/120's. But all evening his spo2 has been around and ranging 85 to maybe 90. (and that is with a breathing treatment) Also some memory issues but I am not for if that's related. Any advise? He is very stubborn I can't convince him that I think he is sick.