I had a severe burnout a few years ago. I haven't fully recovered yet, but while going through it, I had no energy/motivation to think about work, nor doing it either. As of now, I'm fine with working, thinking and having meetings, but I've limited myself to work from 9am to 6pm, with a 1-2h lunch break. I do some side projects on my spare time, but sometimes I get enough of it as well, so I just spend my days watching TV, playing with my dogs etc. You have all of my sympathy.