I’ve been struggling with muscle weakness and some anxiety (although some of it situational) for the last 2.5 months. I’ve had bloodwork done near the start of it, and everything was more or less “fine” according to typical ranges. I’ve tried adding extra vitamin D supplementation, supercharging my protein intake, time off the bike, carb loading, and so far haven’t found the fix. Just stumbled across this thread and I definitely identify with the “my legs feel like crap even when I just try to walk up the stairs”. My ferritin was 71 in April, wondering if I’m just a hair low based on OPs experience. Might try a little ferrous sulfate for a couple of weeks and see how it goes. It seems like a stretch but I’ve tried about everything so far, and all the little details of my symptoms seem like something iron related. Even wondered with my wife when this started whether I was iron deficient based on the symptoms but thought the blood work ruled that out.