I had a convergence of a few things that caused a huge burnout - building work on my house, 18 month long software project implementation that eventually failed, and stress that comes from being a sole provider.

Ultimately I woke one day and couldn't talk, this went on for a couple of weeks. It wasn't until 4 to 6 weeks later that I could get out of bed. I just broke.

Discovered from this that I was autistic and had an autistic burnout, but I've not been the same since, I'm better than I was but lesser than before.