I am new to the site. In fact, I googled “whole body fatigue from lifting arms” and found this. I got mono 10 years ago, and never fully recovered. My symptoms have changed a bit over time, but the most consistent is that I cannot put my arms over my head at all without completely crashing (usually within a few hours and lasting for at least a day or so). I don’t quite seem to fit the mold for POTS or chronic fatigue or any autoimmune disorder, but I’m going to try to find some more answers. I’ve been to many doctors and no one has been able to diagnose me. When I crash, I also have runny, sneezy nose (anyone else?) I’d be happy to share more symptoms (I’ve been tracking this for 10 years now), if that’s helpful to anyone else. I’d love to hear thoughts!!!