I've had to separate a couple of people from the company. In both cases they very quickly found another job, and on following up with them they were much happier doing something that looks quite different from what they were trying to do before.

The world is big, and the chances that you happen to be in the optimal role at the optimal company are vanishingly small. In my book, a category of management failure is letting someone doggedly clutch on to something that's hard on both themselves and those around them.

Sorry you had to deal with that, but I'm glad you're back in the pilots seat!