So I am having issues that began with shortness of breath, low 02 fluctuating 84-92; then continued to get worse where I had to be put on O2 24/7 . One day I went without for 2 minutes and my o2 dropped to 69 and heart rate to 37 just kept dropping until I was able to get back on o2. Heart tests; lung tests, ct's mri etc show everything is fine. A few weeks later my sugar dropped to 57 and I was hospitalized a couple days why they worked at stabilizing it. Heart rate would drop into 40's out of the blue or skyrocket to 150 etc. Two months later and I no longer have to be on o2 24/7. But my o2 still fluctuates from 87 to 98 every 6 minutes or so day and night (less at night when lying down). Very fatigued most days with fogging brain. Cardiologist indicates all this is normal. (never was normal for me before) Pulmonologist is still searching for answers. My body seems to be adjusting to this being the norm. Any suggestions?? I am going to try some of the breathing exercises some have tried.