Annual professional crisis

Once a year, at least, I suffer from professional crisis. It's a time where I question every single step I've taken in my career as a teacher and get sad for the time I wasted during my educational crisis more than 10 years ago. It's ridiculous. I wish I could say it's pointless, though. It's not. When in a crisis I usually take great decisions and and decide to change things around. The only problem is that this time I cannot precise what the problem is. Or maybe this time the problem is more difficult to solve than before.