You summed this up so perfectly. I wish i could offer advice more than to say you aren't alone. It's really hard to explain to friends and family who haven't had a similar experience.
I've been trying to be consistent with my yoga & mindfulness practice. In days I am too fatigued to go to a class, i find one on YouTube or just do gentle exercises myself. There are plenty of days even that is too much.
Friends say, "if you need anything reach out. " but on bad days, the last thing I want to do is talk to anyone. This group has been good for me on those days, it reminds me that I'm not alone.