I've noticed that during my times of burnout I code less at home. I do what I need to at work and go do something else. Sometimes this involves taking up an alternative hobby until I feel the spark again. The last time this happened I didn't code outside work for 10 months. That's how I knew I was burned out. I love to write code and explore things.

I've also left jobs that burned me out for no real reason. For example, I was on a project where there were two of us holding down a critical piece of software. After hearing we will get more engineers for the Nth time I just gave up and left. I couldn't do the constant on-call, being the liaison for bugs and everything, etc.

I also deliberately avoid going into management to fix my burnout because you simply just transmute your burnout into a different form. What you need is a break. You may not wish to quit your job but it is important that you minimize your work as much as you can possibly and focus on yourself. Given you are working double a normal schedule you may even consider saving up enough money to take a month off and then looking for a new job.