I had this happen. First time I'd used a framework for more than a few screens. Totally new way of doing things. Learning RXJS, made a mistake in understanding

I had this happen. First time I'd used a framework for more than a few screens. Totally new way of doing things. Learning RXJS, made a mistake in understanding one of the more strange requirements. Time blew out. But the delivery date was 3 months. Worked crazy hours, product didn't ship the entire thing was seen as a failure. I was burnt out for a good 6 months after that. Even simple tasks took all of my will power to do. It was horrible. 3 months of the hardest work I've done and considered a failure for it.