I've had several periods in my career where I "felt" like I just couldn't get things done. Some weeks ago, I faced panic attacks and anxiety for the first time of my life due to unmanageable workload combine with nastiest politics going on a my workplace.

This actually changed it for me. I still feel fear that I'm broken permanently.

So, yes, another anecdote. Everyone just needs to really take care by managing themselfes. Working fixed hours only instead of trying to get features by the end of the day / week has done did it for me.